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Get to Know Your Brain

February 18, 2022

Frontal Lobe: Aids in complex thinking, learning, and problem-solving

Parietal Lobe: Helps under language and information from the five senses

Occipital Lobe: Processes visual information such as faces and objects

Cerebellum: Responsible for balance and coordination

Brain Stem: Controls basic body functions such as breathing and heart rate

Temporal Lobe: Responsible for hearing and understanding sounds

Cerebral Cortex: The outer layer of the brain that gets wrinklier as you learn new things

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Brain Anatomy and How the Brain Works

What is the brain.

The brain is a complex organ that controls thought, memory, emotion, touch, motor skills, vision, breathing, temperature, hunger and every process that regulates our body. Together, the brain and spinal cord that extends from it make up the central nervous system, or CNS.

What is the brain made of?

Weighing about 3 pounds in the average adult, the brain is about 60% fat. The remaining 40% is a combination of water, protein, carbohydrates and salts. The brain itself is a not a muscle. It contains blood vessels and nerves, including neurons and glial cells.

What is the gray matter and white matter?

Gray and white matter are two different regions of the central nervous system. In the brain, gray matter refers to the darker, outer portion, while white matter describes the lighter, inner section underneath. In the spinal cord, this order is reversed: The white matter is on the outside, and the gray matter sits within.

Gray matter is primarily composed of neuron somas (the round central cell bodies), and white matter is mostly made of axons (the long stems that connects neurons together) wrapped in myelin (a protective coating). The different composition of neuron parts is why the two appear as separate shades on certain scans.

Each region serves a different role. Gray matter is primarily responsible for processing and interpreting information, while white matter transmits that information to other parts of the nervous system.

How does the brain work?

The brain sends and receives chemical and electrical signals throughout the body. Different signals control different processes, and your brain interprets each. Some make you feel tired, for example, while others make you feel pain.

Some messages are kept within the brain, while others are relayed through the spine and across the body’s vast network of nerves to distant extremities. To do this, the central nervous system relies on billions of neurons (nerve cells).

Main Parts of the Brain and Their Functions

At a high level, the brain can be divided into the cerebrum, brainstem and cerebellum.

The cerebrum (front of brain) comprises gray matter (the cerebral cortex) and white matter at its center. The largest part of the brain, the cerebrum initiates and coordinates movement and regulates temperature. Other areas of the cerebrum enable speech, judgment, thinking and reasoning, problem-solving, emotions and learning. Other functions relate to vision, hearing, touch and other senses.

Cerebral Cortex

Cortex is Latin for “bark,” and describes the outer gray matter covering of the cerebrum. The cortex has a large surface area due to its folds, and comprises about half of the brain’s weight.

The cerebral cortex is divided into two halves, or hemispheres. It is covered with ridges (gyri) and folds (sulci). The two halves join at a large, deep sulcus (the interhemispheric fissure, AKA the medial longitudinal fissure) that runs from the front of the head to the back. The right hemisphere controls the left side of the body, and the left half controls the right side of the body. The two halves communicate with one another through a large, C-shaped structure of white matter and nerve pathways called the corpus callosum. The corpus callosum is in the center of the cerebrum.

The brainstem (middle of brain) connects the cerebrum with the spinal cord. The brainstem includes the midbrain, the pons and the medulla.

• Midbrain. The midbrain (or mesencephalon) is a very complex structure with a range of different neuron clusters (nuclei and colliculi), neural pathways and other structures. These features facilitate various functions, from hearing and movement to calculating responses and environmental changes. The midbrain also contains the substantia nigra, an area affected by Parkinson’s disease that is rich in dopamine neurons and part of the basal ganglia, which enables movement and coordination.
• Pons. The pons is the origin for four of the 12 cranial nerves, which enable a range of activities such as tear production, chewing, blinking, focusing vision, balance, hearing and facial expression. Named for the Latin word for “bridge,” the pons is the connection between the midbrain and the medulla.
• Medulla. At the bottom of the brainstem, the medulla is where the brain meets the spinal cord. The medulla is essential to survival. Functions of the medulla regulate many bodily activities, including heart rhythm, breathing, blood flow, and oxygen and carbon dioxide levels. The medulla produces reflexive activities such as sneezing, vomiting, coughing and swallowing.

The spinal cord extends from the bottom of the medulla and through a large opening in the bottom of the skull. Supported by the vertebrae, the spinal cord carries messages to and from the brain and the rest of the body.

The cerebellum (“little brain”) is a fist-sized portion of the brain located at the back of the head, below the temporal and occipital lobes and above the brainstem. Like the cerebral cortex, it has two hemispheres. The outer portion contains neurons, and the inner area communicates with the cerebral cortex. Its function is to coordinate voluntary muscle movements and to maintain posture, balance and equilibrium. New studies are exploring the cerebellum’s roles in thought, emotions and social behavior, as well as its possible involvement in addiction, autism and schizophrenia.

Brain Coverings: Meninges

Three layers of protective covering called meninges surround the brain and the spinal cord.

• The outermost layer, the dura mater , is thick and tough. It includes two layers: The periosteal layer of the dura mater lines the inner dome of the skull (cranium) and the meningeal layer is below that. Spaces between the layers allow for the passage of veins and arteries that supply blood flow to the brain.
• The arachnoid mater is a thin, weblike layer of connective tissue that does not contain nerves or blood vessels. Below the arachnoid mater is the cerebrospinal fluid, or CSF. This fluid cushions the entire central nervous system (brain and spinal cord) and continually circulates around these structures to remove impurities.
• The pia mater is a thin membrane that hugs the surface of the brain and follows its contours. The pia mater is rich with veins and arteries.

Lobes of the Brain and What They Control

Each brain hemisphere (parts of the cerebrum) has four sections, called lobes: frontal, parietal, temporal and occipital. Each lobe controls specific functions.

• Frontal lobe. The largest lobe of the brain, located in the front of the head, the frontal lobe is involved in personality characteristics, decision-making and movement. Recognition of smell usually involves parts of the frontal lobe. The frontal lobe contains Broca’s area, which is associated with speech ability.
• Parietal lobe. The middle part of the brain, the parietal lobe helps a person identify objects and understand spatial relationships (where one’s body is compared with objects around the person). The parietal lobe is also involved in interpreting pain and touch in the body. The parietal lobe houses Wernicke’s area, which helps the brain understand spoken language.
• Occipital lobe. The occipital lobe is the back part of the brain that is involved with vision.
• Temporal lobe. The sides of the brain, temporal lobes are involved in short-term memory, speech, musical rhythm and some degree of smell recognition.

Deeper Structures Within the Brain

Pituitary gland.

Sometimes called the “master gland,” the pituitary gland is a pea-sized structure found deep in the brain behind the bridge of the nose. The pituitary gland governs the function of other glands in the body, regulating the flow of hormones from the thyroid, adrenals, ovaries and testicles. It receives chemical signals from the hypothalamus through its stalk and blood supply.

Hypothalamus

The hypothalamus is located above the pituitary gland and sends it chemical messages that control its function. It regulates body temperature, synchronizes sleep patterns, controls hunger and thirst and also plays a role in some aspects of memory and emotion.

Small, almond-shaped structures, an amygdala is located under each half (hemisphere) of the brain. Included in the limbic system, the amygdalae regulate emotion and memory and are associated with the brain’s reward system, stress, and the “fight or flight” response when someone perceives a threat.

Hippocampus

A curved seahorse-shaped organ on the underside of each temporal lobe, the hippocampus is part of a larger structure called the hippocampal formation. It supports memory, learning, navigation and perception of space. It receives information from the cerebral cortex and may play a role in Alzheimer’s disease.

Pineal Gland

The pineal gland is located deep in the brain and attached by a stalk to the top of the third ventricle. The pineal gland responds to light and dark and secretes melatonin, which regulates circadian rhythms and the sleep-wake cycle.

Ventricles and Cerebrospinal Fluid

Deep in the brain are four open areas with passageways between them. They also open into the central spinal canal and the area beneath arachnoid layer of the meninges.

The ventricles manufacture cerebrospinal fluid , or CSF, a watery fluid that circulates in and around the ventricles and the spinal cord, and between the meninges. CSF surrounds and cushions the spinal cord and brain, washes out waste and impurities, and delivers nutrients.

Blood Supply to the Brain

Two sets of blood vessels supply blood and oxygen to the brain: the vertebral arteries and the carotid arteries.

The external carotid arteries extend up the sides of your neck, and are where you can feel your pulse when you touch the area with your fingertips. The internal carotid arteries branch into the skull and circulate blood to the front part of the brain.

The vertebral arteries follow the spinal column into the skull, where they join together at the brainstem and form the basilar artery , which supplies blood to the rear portions of the brain.

The circle of Willis , a loop of blood vessels near the bottom of the brain that connects major arteries, circulates blood from the front of the brain to the back and helps the arterial systems communicate with one another.

Cranial Nerves

Inside the cranium (the dome of the skull), there are 12 nerves, called cranial nerves:

• Cranial nerve 1: The first is the olfactory nerve, which allows for your sense of smell.
• Cranial nerve 2: The optic nerve governs eyesight.
• Cranial nerve 3: The oculomotor nerve controls pupil response and other motions of the eye, and branches out from the area in the brainstem where the midbrain meets the pons.
• Cranial nerve 4: The trochlear nerve controls muscles in the eye. It emerges from the back of the midbrain part of the brainstem.
• Cranial nerve 5: The trigeminal nerve is the largest and most complex of the cranial nerves, with both sensory and motor function. It originates from the pons and conveys sensation from the scalp, teeth, jaw, sinuses, parts of the mouth and face to the brain, allows the function of chewing muscles, and much more.
• Cranial nerve 6: The abducens nerve innervates some of the muscles in the eye.
• Cranial nerve 7: The facial nerve supports face movement, taste, glandular and other functions.
• Cranial nerve 8: The vestibulocochlear nerve facilitates balance and hearing.
• Cranial nerve 9: The glossopharyngeal nerve allows taste, ear and throat movement, and has many more functions.
• Cranial nerve 10: The vagus nerve allows sensation around the ear and the digestive system and controls motor activity in the heart, throat and digestive system.
• Cranial nerve 11: The accessory nerve innervates specific muscles in the head, neck and shoulder.
• Cranial nerve 12: The hypoglossal nerve supplies motor activity to the tongue.

The first two nerves originate in the cerebrum, and the remaining 10 cranial nerves emerge from the brainstem, which has three parts: the midbrain, the pons and the medulla.

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The Anatomy of the Brain

The brain controls your thoughts, feelings, and physical movements

Associated Conditions

The brain is a unique organ that is responsible for many functions such as problem-solving, thinking, emotions, controlling physical movements, and mediating the perception and responses related to the five senses. The many nerve cells of the brain communicate with each other to control this activity.

Each area of the brain has one or more functions. The skull, which is composed of bone, protects the brain. A number of different health conditions can affect the brain, including headaches , seizures , strokes , multiple sclerosis , and more. These conditions can often be managed with medical or surgical care.

The brain is primarily composed of nerve cells, which are also called neurons. Blood vessels supply oxygen and nutrients to the neurons of the brain. Cerebrospinal fluid (CSF), a fluid that provides nourishment and immune protection to the brain, flows around the brain and within the ventricular system (spaces between the regions of the brain).

The brain and the CSF are protected by the meninges, composed of three layers of connective tissue: the pia, arachnoid, and dura layers. The skull surrounds the meninges.

The brain has many important regions, such as the cerebral cortex, brainstem, and cerebellum. The areas of the brain all interact with each other through hormones and nerve stimulation.

The regions of the brain include:

• Cerebral cortex : This is the largest portion of the brain. It includes two hemispheres (halves), which are connected to each other—physically and functionally—by the corpus callosum. The corpus callosum runs from the front of the cerebral cortex to the back of the cerebral cortex. The outer part of the cerebral cortex is often described as gray matter, and the deeper areas are often described as white matter due to their microscopic appearance.
• Lobes of the cerebral cortex : Each hemisphere of the cerebral cortex is composed of four lobes. The frontal lobes are the largest, and they are located at the front of the brain. The temporal lobes are located on the sides of the brain, near and above the ears. The parietal lobes are at the top middle section of the brain. And the occipital lobes, which are the smallest lobes, are located in the back of the cerebral cortex.
• Limbic system : The limbic system is located deep in the brain and is composed of several small structures, including the hippocampus, amygdala, thalamus, and hypothalamus .
• Internal capsule : This area is located deep in the brain and is considered white matter. The frontal regions of the cerebral cortex surround the left and right internal capsules. The internal capsule is located near the lateral ventricles.
• Thalamus : The left and right thalami are below the internal capsule, above the brainstem, and near the lateral ventricles.
• Hypothalamus and pituitary gland : The hypothalamus is a tiny region of the brain located directly above the pituitary gland. The pituitary gland is a structure that extends directly above the optic chiasm, where the optic nerves meet.
• Brainstem : The brainstem is the lowest region of the brain and is continuous with the spinal cord. It is composed of three sections: the midbrain, pons, and medulla. The cranial nerves emerge from the brainstem.
• Cerebellum : The cerebellum is located at the lower back of the brain, under the occipital lobe and behind the brainstem. It has two hemispheres (left and right) that are connected by a middle structure called the vermis.
• Blood vessels : The blood vessels that supply your brain include the anterior cerebral arteries , middle cerebral arteries , posterior cerebral arteries, basilar artery , and vertebral arteries . These blood vessels and the blood vessels that connect them to each other compose a collection of blood vessels described as the circle of Willis .
• Ventricular system : CSF flows in the right and left lateral ventricles, the third ventricle, the cerebral aqueduct, the fourth ventricle, and down into the central canal in the spinal cord.

The brain has a number of functions, including motor function (controlling the body’s movements), coordination, sensory functions (being aware of sensations), hormone control, regulation of the heart and lungs, emotions, memory, behavior, and creativity.

These functions often rely on and interact with each other. For example, you might experience an emotion based on something that you see and/or hear. Or you might try to solve a problem with the help of your memory. Messages travel very quickly between the different regions in the brain, which makes the interactions almost instantaneous.

Functions of the brain include:

• Motor function : Motor function is initiated in an area at the back of the frontal lobe called the motor homunculus. This region controls movement on the opposite side of the body by sending messages through the internal capsule to the brainstem, then to the spinal cord, and finally to a spinal nerve through a pathway described as the corticospinal tract.
• Coordination and balance : Your body maintains balance and coordination through a number of pathways in the cerebral cortex, cerebellum, and brainstem.
• Sensation : The brain receives sensory messages through a pathway that travels from the nerves in the skin and organs to the spine, then to the brainstem, up through the thalamus, and finally to an area of the parietal lobe called the sensory homunculus, which is directly behind the motor homunculus. Each hemisphere receives sensory input from the opposite side of the body. This pathway is called the spinothalamic tract.
• Vision : Your optic nerves in your eyes can detect whatever you see, sending messages through your optic tract (pathway) to your occipital lobes. The occipital lobes put those messages together so that you can perceive what you are seeing in the world around you.
• Taste and smell : Your olfactory nerve detects smell, while several of your cranial nerves work together to detect taste. These nerves send messages to your brain. The sensations of smell and taste often interact, as smell amplifies your experience of taste.
• Hearing : You can detect sounds when a series of vibrations in your ear stimulate your vestibulocochlear nerve. The message is sent to your brainstem and then to your temporal cortex so that you can make sense of the sounds that you hear.
• Language : Speaking and understanding language is a specialized brain function that involves several regions of your dominant hemisphere (the side of the brain opposite your dominant hand). The two major areas that control speech are Wernicke’s area , which controls the understanding of speech, and Broca’s area, which controls the fluency of your speech.
• Emotions and memory : Your amygdala and hippocampus play important roles in storing memory and associating certain memories with emotion.
• Hormones : Your hypothalamus, pituitary gland, and medulla all respond to the conditions of your body, such as your temperature, carbon dioxide level, and hormone levels, by releasing hormones and other chemicals that help regulate your body’s functions. Emotions such as fear can also have an influence on these functions.
• Behavior and judgment : The frontal lobes control reasoning, planning, and maintaining social interactions. This area of the brain is also involved in judgment and maintaining appropriate behavior.
• Analytical thinking : Mathematical problem solving is located in the dominant hemisphere. Often, this type of reasoning involves interaction with the decision-making regions of the frontal lobes.
• Creativity : There are many types of creativity, including the production of visual art, music, and creative writing. These skills can involve three-dimensional thinking, also described as visual-spatial skills. Creativity also involves analytical reasoning and usually requires a balance between traditional ways of thinking (which occurs in the frontal lobes) and "thinking outside the box."

There are many conditions that can affect the brain. You may experience self-limited issues, such as the pain of a headache, or more lasting effects of brain disease, such as paralysis due to a stroke. The diagnosis of brain illnesses may be complex and can involve a variety of medical examinations and tests, including a physical examination, imaging tests, neuropsychological testing, electroencephalography (EEG) , and/or lumbar puncture .

Common conditions that involve the brain include:

• Headaches : Head pain can occur due to chronic migraines or tension headaches. You can also have a headache when you feel sleepy, stressed, or due to an infection like meningitis (an infection of the meninges).
• Traumatic brain injury : An injury to the head can cause damage such as bleeding in the brain, a skull fracture, a bruise in the brain, or, in severe cases, death. These injuries may cause vision loss, paralysis, or severe cognitive (thinking) problems.
• Concussion : Head trauma can cause issues like loss of consciousness, memory impairment, and mood changes. These problems may develop even in the absence of bleeding or a skull fracture. Often, symptoms of a concussion resolve over time, but recurrent head trauma can cause serious and persistent problems with brain function, described as chronic traumatic encephalopathy (CTE).
• Transient ischemic attack (TIA) : A temporary interruption in the blood supply to the brain can cause the affected areas to temporarily lose function. This can happen due to a blood clot, usually coming from the heart or carotid arteries. If the interruption in blood flow resolves before permanent brain damage occurs, this is called a TIA . Generally, a TIA is considered a warning that a person is at risk of having a stroke, so a search for stroke causes is usually necessary—and stroke prevention often needs to be initiated.
• Stroke : A stroke is brain damage that occurs due to an interruption of blood flow to the brain. This can occur due to a blood clot (ischemic stroke) or a bleed in the brain (hemorrhagic stroke) . There are a number of causes of ischemic and hemorrhagic stroke, including heart disease, hypertension, and brain aneurysms.
• Brain aneurysm : An aneurysm is an outpouching of a blood vessel. A brain aneurysm can cause symptoms due to pressure on nearby structures. An aneurysm can also bleed or rupture, causing a hemorrhage in the brain. Sometimes an aneurysm can be surgically repaired before it ruptures, preventing serious consequences.
• Dementia : Degenerative disease of the regions in the brain that control memory and behavior can cause a loss of independence. This can occur in several conditions, such as Alzheimer’s disease , Lewy body dementia, Pick’s disease, and vascular dementia (caused by having many small strokes).
• Multiple sclerosis (MS) : This is a condition characterized by demyelination (loss of the protective fatty coating around nerves) in the brain and spine. MS can cause a variety of effects, such as vision loss, muscle weakness, and sensory changes. The disease course can be characterized by exacerbations and remissions, a progressive decline, or a combination of these processes.
• Parkinson’s disease : This condition is a progressive movement disorder that causes tremors of the body (especially the arms), stiffness of movements, and a slow, shuffling pattern of walking. There are treatments for this condition, but it is not curable.
• Epilepsy : Recurrent seizures can occur due to brain damage or congenital (from birth) epilepsy. These episodes may involve involuntary movements, diminished consciousness, or both. Seizures usually last for a few seconds at a time, but prolonged seizures (status epilepticus) can occur as well. Anti-epileptic medications can help prevent seizures, and some emergency anti-epileptic medications can be used to stop a seizure while it is happening.
• Meningitis or encephalitis : An infection or inflammation of the meninges (meningitis) or the brain (encephalitis) can cause symptoms such as fever, stiff neck, headache, or seizures. With treatment, meningitis usually improves without lasting effects, but encephalitis can cause brain damage, with long-term neurological impairment.
• Brain tumors : A primary brain tumor starts in the brain, and brain tumors from the body can metastasize (spread) to the brain as well. These tumors can cause symptoms that correlate to the affected area of the brain. Brain tumors also may cause swelling in the brain and hydrocephalus (a disruption of the CSF flow in the ventricular system). Treatments include surgery, chemotherapy, and radiation therapy.

If you have a condition that could be affecting your brain, there are a number of complex tests that your medical team may use to identify the problem. Most important, a physical exam and mental status examination can determine whether there is any impairment of brain function and pinpoint the deficits. For example, you may have weakness of one part of the body, vision loss, trouble walking, personality or memory changes, or a combination of these issues. Other signs, such as rash or fever, which are not part of the neurological physical examination, can also help identify systemic issues that could be causing your symptoms.

Diagnostic tests include brain imaging tests such as computerized tomography (CT), magnetic resonance imaging (MRI), or functional magnetic resonance imaging (fMRI). These tests can identify structural and functional abnormalities. And sometimes, tests such as CT angiography (CTA), MRI angiography (MRA), or interventional cerebral angiography are needed to visualize the blood vessels in the brain.

Another test, an evoked potential test, can be used to identify hearing or vision problems in some circumstances. And a lumbar puncture may be used to evaluate the CSF surrounding the brain. This test can detect evidence of infection, inflammation, or cancer. Rarely, a brain biopsy is used to sample a tiny area of the brain to assess the abnormalities.

Thau L, Singh P. Anatomy, central nervous system . StatPearls.

Calso C, Besnard J, Allain P. Frontal lobe functions in normal aging: Metacognition, autonomy, and quality of life . Exp Aging Res . 2019;45(1):10-27. doi:10.1080/0361073X.2018.1560105

Ferry B, DeCastro A. Concussion . StatPearls.

Panuganti KK, Tadi P, Lui F. Transient ischemic attack . StatPearls.

Párraga RG, Possatti LL, Alves RV, Ribas GC, Türe U, de Oliveira E. Microsurgical anatomy and internal architecture of the brainstem in 3D images: surgical considerations . J Neurosurg . 2016;124(5):1377-95. doi:10.3171/2015.4.JNS132778

Talo M, Yildirim O, Baloglu UB, Aydin G, Acharya UR. Convolutional neural networks for multi-class brain disease detection using MRI images . Comput Med Imaging Graph . 2019;10:101673. doi:10.1016/j.compmedimag.2019.101673

By Heidi Moawad, MD Dr. Moawad is a neurologist and expert in brain health. She regularly writes and edits health content for medical books and publications.

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Parts of the Brain and Their Functions

The human brain is the epicenter of our nervous system and plays a pivotal role in virtually every aspect of our lives. It’s a complex, highly organized organ responsible for thoughts, feelings, actions, and interactions with the world around us. Here is a look at the intricate anatomy of the brain, its functions, and the consequences of damage to different areas.

Introduction to the Brain and Its Functions

The brain is an organ of soft nervous tissue that is protected within the skull of vertebrates. It functions as the coordinating center of sensation and intellectual and nervous activity. The brain consists of billions of neurons (nerve cells) that communicate through intricate networks. The primary functions of the brain include processing sensory information, regulating bodily functions, forming thoughts and emotions, and storing memories.

Main Parts of the Brain – Anatomy

The three main parts of the brain are the cerebrum, cerebellum, and brainstem.

1. Cerebrum

• Location: The cerebellum occupies the upper part of the cranial cavity and is the largest part of the human brain.
• Functions: It’s responsible for higher brain functions, including thought, action, emotion, and interpretation of sensory data.
• Effects of Damage: Depending on the area affected, damage leads to memory loss, impaired cognitive skills, changes in personality, and loss of motor control.

2. Cerebellum

• Location: The cerebellum is at the back of the brain, below the cerebrum.
• Functions: It coordinates voluntary movements such as posture, balance, coordination, and speech.
• Effects of Damage: Damage causes problems with balance, movement, and muscle coordination (ataxia).

3. Brainstem

• Location: The brainstem is lower extension of the brain, connecting to the spinal cord. It includes the midbrain, pons, and medulla oblongata.
• Functions: This part of the brain controls many basic life-sustaining functions, including heart rate, breathing, sleeping, and eating.
• Effects of Damage: Damage results in life-threatening conditions like breathing difficulties, heart problems, and loss of consciousness.

Lobes of the Brain

The four lobes of the brain are regions of the cerebrum:

• Location: This is the anterior or front part of the brain.
• Functions: Decision making, problem solving, control of purposeful behaviors, consciousness, and emotions.
• Location: Sits behind the frontal lobe.
• Functions: Processes sensory information it receives from the outside world, mainly relating to spatial sense and navigation (proprioception).
• Location: Below the lateral fissure, on both cerebral hemispheres.
• Functions: Mainly revolves around auditory perception and is also important for the processing of both speech and vision (reading).
• Location: At the back of the brain.
• Functions: Main center for visual processing.

Left vs. Right Brain Hemispheres

The cerebrum has two halves, called hemispheres. Each half controls functions on the opposite side of the body. So, the left hemisphere controls muscles on the right side of the body, and vice versa. But, the functions of the two hemispheres are not entirely identical:

• Left Hemisphere: It’s dominant in language and speech and plays roles in logical thinking, analysis, and accuracy. .
• Right Hemisphere: This hemisphere is more visual and intuitive and functions in creative and imaginative tasks.

The corpus callosum is a band of nerves that connect the two hemispheres and allow communication between them.

Detailed List of Parts of the Brain

While knowing the three key parts of the brain is a good start, the anatomy is quite a bit more complex. In addition to nervous tissues, the brain also contains key glands:

• Cerebrum: The cerebrum is the largest part of the brain. Divided into lobes, it coordinates thought, movement, memory, senses, speech, and temperature.
• Corpus Callosum : A broad band of nerve fibers joining the two hemispheres of the brain, facilitating interhemispheric communication.
• Cerebellum : Coordinates movement and balance and aids in eye movement.
• Pons : Controls voluntary actions, including swallowing, bladder function, facial expression, posture, and sleep.
• Medulla oblongata : Regulates involuntary actions, including breathing, heart rhythm, as well as oxygen and carbon dioxide levels.
• Limbic System : Includes the amygdala, hippocampus, and parts of the thalamus and hypothalamus.
• Amygdala: Plays a key role in emotional responses, hormonal secretions, and memory formation.
• Hippocampus: Plays a vital role in memory formation and spatial navigation.
• Thalamus : Acts as the brain’s relay station, channeling sensory and motor signals to the cerebral cortex, and regulating consciousness, sleep, and alertness.
• Basal Ganglia : A group of structures involved in processing information related to movement, emotions, and reward. Key structures include the striatum, globus pallidus, substantia nigra, and subthalamic nucleus.
• Ventral Tegmental Area (VTA) : Plays a role in the reward circuit of the brain, releasing dopamine in response to stimuli indicating a reward.
• Optic tectum : Also known as the superior colliculus, it directs eye movements.
• Substantia Nigra : Involved in motor control and contains a large concentration of dopamine-producing neurons.
• Cingulate Gyrus : Plays a role in processing emotions and behavior regulation. It also helps regulate autonomic motor function.
• Olfactory Bulb : Involved in the sense of smell and the integration of olfactory information.
• Mammillary Bodies : Plays a role in recollective memory.
• Function: Regulates emotions, memory, and arousal.

Glands in the Brain

The hypothalamus, pineal gland, and pituitary gland are the three endocrine glands within the brain:

• Hypothalamus : The hypothalamus links the nervous and endocrine systems. It contains many small nuclei. In addition to participating in eating and drinking, sleeping and waking, it regulates the endocrine system via the pituitary gland. It maintains the body’s homeostasis, regulating hunger, thirst, response to pain, levels of pleasure, sexual satisfaction, anger, and aggressive behavior.
• Pituitary Gland : Known as the “master gland,” it controls various other hormone glands in the body, such as the thyroid and adrenals, as well as regulating growth, metabolism, and reproductive processes.
• Pineal Gland : The pineal gland produces and regulates some hormones, including melatonin, which is crucial in regulating sleep patterns and circadian rhythms.

Gray Matter vs. White Matter

The brain and spinal cord consist of gray matter (substantia grisea) and white matter (substantia alba).

• White Matter: Consists mainly of axons and myelin sheaths that send signals between different brain regions and between the brain and spinal cord.
• Gray Matter: Consists of neuronal cell bodies, dendrites, and axon terminals. Gray matter processes information and directs stimuli for muscle control, sensory perception, decision making, and self-control.

Frequently Asked Questions (FAQs) About the Human Brain

• The human brain contains approximately 86 billion neurons. Additionally, it has a similar or slightly higher number of non-neuronal cells (glial cells), making the total number of cells in the brain close to 170 billion.
• There are about 86 billion neurons in the human brain. These neurons are connected by trillions of synapses, forming a complex networks.
• The average adult human brain weighs about 1.3 to 1.4 kilograms (about 3 pounds). This weight represents about 2% of the total body weight.
• The brain is about 73% water.
• The myth that humans only use 10% of their brain is false. Virtually every part gets use, and most of the brain is active all the time, even during sleep.
• The average size of the adult human brain is about 15 centimeters (6 inches) in length, 14 centimeters (5.5 inches) in width, and 9 centimeters (3.5 inches) in height.
• Brain signal speeds vary depending on the type of neuron and the nature of the signal. They travel anywhere from 1 meter per second to over 100 meters per second in the fastest neurons.
• With age, the brain’s volume and/or weight decrease, synaptic connections reduce, and there can be a decline in cognitive functions. However, the brain to continues adapting and forming new connections throughout life.
• The brain has a limited ability to repair itself. Neuroplasticity aids recovery by allowing other parts of the brain to take over functions of the damaged areas.
• The brain consumes about 20% of the body’s total energy , despite only making up about 2% of the body’s total weight . It requires a constant supply of glucose and oxygen.
• Sleep is crucial for brain health. It aids in memory consolidation, learning, brain detoxification, and the regulation of mood and cognitive functions.
• Douglas Fields, R. (2008). “White Matter Matters”. Scientific American . 298 (3): 54–61. doi: 10.1038/scientificamerican0308-54
• Kandel, Eric R.; Schwartz, James Harris; Jessell, Thomas M. (2000). Principles of Neural Science (4th ed.). New York: McGraw-Hill. ISBN 978-0-8385-7701-1.
• Kolb, B.; Whishaw, I.Q. (2003). Fundamentals of Human Neuropsychology (5th ed.). New York: Worth Publishing. ISBN 978-0-7167-5300-1.
• Rajmohan, V.; Mohandas, E. (2007). “The limbic system”. Indian Journal of Psychiatry . 49 (2): 132–139. doi: 10.4103/0019-5545.33264
• Shepherd, G.M. (1994). Neurobiology . Oxford University Press. ISBN 978-0-19-508843-4.

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September 9, 2021

How the brain solves problems

by Delia Du Toit, Wits University

In trying to think of an introduction for this article it occurred to me that had I been inside an MRI, the screen would have showed several brain regions lighting up like Times Square as my mind was attempting to solve the problem.

First, the prefrontal cortex, basal ganglia and thalamus would recognize that the blank page meant that there was a problem that needed to be solved. The thought that the editor might not favor this first-person account in a science article would send the limbic system , the primal part of the brain where emotions are processed, into overdrive. The amygdala, that little almond-shaped nugget at the base of the brain, would look like a Christmas tree as anxiety ticked up.

Finally, as words started filling the screen, the prefrontal cortex behind the forehead would flicker and flash. The hippocampus would access memories of previous similar articles, the information-gathering process and even school-level English classes decades ago, to help the process along. And all this activity would happen at once.

Holistic problem solving

Depending on the problem in front of you, the entire brain could be involved in trying to find a solution, says Professor Kate Cockcroft, Division Leader of cognitive neuroscience at the Neuroscience Research Laboratory (Wits NeuRL) in the School of Human and Community Development.

"You would use many different brain regions to solve a problem, especially a novel or difficult one. The idea of processes being localized in one or two parts of the brain has been replaced with newer evidence that it is the connections among brain areas and their interaction that is important in cognitive processes . Some areas may be more activated with certain problems—a visual problem would activate the visual cortices, for example.

"All this activity takes place as electrochemical signals. The signals form within neurons, pass along the branch-like axons and jump from one neuron to the next across gaps called synapses, with the help of neurotransmitter chemicals. The pattern, size, shape and number of these signals, what they communicate with, and the region of the brain in which they happen, determine what they achieve."

Although problem solving is a metacognitive—"thinking about thinking"—process, that does not make it solely the domain of the highly evolved human prefrontal cortex , adds Dr. Sahba Besharati, Division Leader of social-affective neuroscience at NeuRL.

"This is the most recently evolved part of the human brain, but problem solving does not happen in isolation—it's immersed in a social context that influences how we interpret information. Your background, gender, religion or emotions, among other factors, all influence how you interpret a problem. This means that it would involve other brain areas like the limbic system, one of the oldest brain systems housed deep within the cortex," says Besharati.

"Problem-solving abilities are not a human peculiarity. Some animals are even better than us at solving certain problems, but we all share basic problem-solving skills—if there's danger, leave; if you're hungry, find food."

None of this would be possible without memory either, says Cockcroft. "Without it, we would forget what it is that we are trying to solve and we wouldn't be able to use past experiences to help us solve it."

And memory is, again, linked to emotion. "We use this information to increase the likelihood of positive results when solving new problems," she says.

Improving your skills

It has been proven time and again that just about any brain process can be improved—including problem-solving abilities. "Brain plasticity is a real thing—the brain can reorganize itself with targeted intervention," says Besharati. "Rehabilitation from neurological injury is a dynamic process and an ever-improving science that has allowed us to understand how the brain can change and adapt in response to the environment. Studies have also shown that simple memorisation exercises can assist tremendously in retaining cognitive skills in old age."

Of course, all these processes depend on your brain recognizing that there's a problem to be dealt with in the first place—if you don't realize you're spending money foolishly, you can't improve your finances. "Recognition of a problem can happen at both a conscious and unconscious level. Stroke patients who are not aware of their motor paralysis, for example, deludedly don't believe that they are paralyzed and will sometimes not engage in rehabilitation. But their delusions often spontaneously recover, suggesting recognition at an unconscious level and that, over time, the brain can restore function."

If all else fails, there might be some value to the adage "sleep on it," says Cockcroft. "Sleep is believed to assist memory consolidation—changing memories from a fragile state in which they can easily be damaged to a permanent state. In doing so, they become stored in different brain regions and new neural connections are formed that may assist problem solving. On waking, you may have formed associations between information that you didn't think of previously. This seems to be most effective within three hours of learning new information—perhaps we should institute compulsory naps for students after lectures!"

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Areas of the Brain

Reviewed by Psychology Today Staff

The human brain, as the seat of mental life—from the most complicated intellectual processes down to routine and unconscious bodily control—is necessarily enormously complex.

The largest part of the brain is the highly-evolved cerebrum. The topmost portion is divided into two hemispheres, each with four lobes, within which are many other subdivisions. The cerebral cortex forms the outer layer of the cerebrum. Nested deeper within the brain are essential structures such as the basal ganglia, the amygdala, and the hippocampus. Toward the bottom of the brain are more primitive structures, including the cerebellum and brain stem. These also fulfill critical functions.

Running through parts of the brain are a dozen pairs of cranial nerves, which link the brain directly to muscles and sense organs in the head, neck, and upper body. The brain also contains four interconnected spaces called ventricles, which produce and are filled with cerebrospinal fluid. This fluid is distributed to the exterior of the brain and to the spinal cord, where it provides a cushion against physical impact and helps maintain normal function.

The brain and spinal cord together form the body’s command structure: the central nervous system. The peripheral nervous system extends body-wide, encompassing nerves that branch out from the spinal cord and the brain.

On This Page

• Hemispheres of the Brain
• Lobes of the Brain
• Beneath the Cortex

The cerebrum is physically divided into two halves—the left hemisphere and right hemisphere—and the functions of which are specialized in certain ways. Both hemispheres work closely together , communicating via a bundle of nerve fibers, the corpus callosum, that forms a bridge between them.

The left hemisphere controls the movement of the opposite (right) side of the body. Among the tasks for which it is specialized are the ability to speak and aspects of language comprehension, though language ability involves both hemispheres. Broca’s area and Wernicke’s area, parts of the brain that are both linked to language, are typically located in the left hemisphere.

The right hemisphere controls the movement of the left side of the body. The right hemisphere is specialized relative to the left in some aspects of spatial processing, including that of three-dimensional relations between objects. It also appears to be especially important for processing non-literal aspects of language, such as metaphors.

While each hemisphere has certain tasks to which it is especially tailored, broad mental activities and qualities such as perception, creativity, and reasoning are handled by both hemispheres together. (For more, see Left Brain - Right Brain. )

The cerebral hemispheres are commonly mapped out based on four large regions—the frontal lobe, the temporal lobe, the parietal lobe, and the occipital lobe—with one of each on either half of the brain.

• The frontal lobes form the front of the cerebrum, starting directly behind the forehead. Important for executive functioning, the frontal lobes are involved in decision-making, attention, producing voluntary movements (controlled by the motor area of the frontal lobe), and speech, along with various other voluntary and involuntary abilities.
• The parietal lobes are located behind the frontal lobes. The parietal lobes contain the primary sensory areas, which are involved in processing information about taste, touch, temperature, and movement. The parietal lobes also play a role in language processing, including reading.
• The temporal lobes sit on the sides of the brain. They contain the primary auditory cortices and process information from the ears; they also work with the occipital lobes to process visual information. The temporal lobes are heavily involved in learning and memory. The medial temporal lobe contains important structures including the hippocampus and amygdala.
• The occipital lobes form the back section of the cerebrum. They contain the primary visual cortices and are crucial for vision.

The cerebral cortex is the thin, outermost layer of the cerebrum, extending across all the brain’s lobes. Just 1.5 to 5 millimeters in width, it is composed of the neurons that make up the brain’s “gray matter” and handles much of the brain’s work. (The gray matter of the cortex is interlinked with the rest of the brain by nerve fibers that make up the brain’s “white matter.”)

The cortex’s distinctive, wrinkled appearance is due to its various ridges (gyri) and grooves (sulci). These provide for a larger total surface area within a condensed space—and hence more room for neurons—than would a totally smooth layer of brain cells.

Buried in the core of the brain are a collection of structures that serve a variety of important functions. Some of these essential components are:

• The thalamus is akin to a relay station, receiving signals going to and from the cerebrum and other parts of the nervous system. It is an integral part of the system of sensory processing, but is also involved in movement, emotion, memory, and other functions. The brain contains two thalami, one on either side.
• The roughly pea-sized hypothalamus , below the thalamus, plays a role in bodily regulation, including the control of body temperature, sleep and wakefulness, hunger, and the release of the stress hormone cortisol and other hormones. The hypothalamus produces a number of hormones itself, including oxytocin, dopamine, vasopressin, and others. It is directly connected to and influences the functioning of the pituitary gland, which releases various hormones into the bloodstream.
• The amygdala is an almond-shaped structure that has a major role in producing emotional responses. It also helps to integrate emotional aspects of experience into memory and to produce fear-based memories and learning. There are a pair of amygdalae in the brain. The amygdala and its neighbor the hippocampus are two major components of the limbic system.
• The hippocampus , named for its resemblance of a seahorse's shape, is central to the creation and filing-away of memories. It is also involved in spatial processing and the ability to find one’s way around. There are two hippocampi in the brain. Along with the amygdalae, they are major parts of the limbic system.
• The clusters of neurons called the basal ganglia are important for coordinating physical movements, including habitual behaviors.

The cerebellum (Latin for “little brain”) is packed with 50 percent of the neurons contained in the whole central nervous system. It is located at the rear and toward the bottom of the brain, beneath the cerebrum and behind the brainstem. Like the larger cerebrum, it contains two hemispheres of its own, each containing an outer layer of grey matter and an inner area of white matter.

The cerebellum plays a central role in the control of the body’s movements and in the learning of physical tasks. Based on signals from the inner ears and the muscles, the cerebellum enables the body to maintain balance and posture.

The brain stem, situated at the bottom of the brain, is made up of three main parts: the midbrain, pons, and medulla oblongata.

• The midbrain is the highest part of the brain stem. Among other functions, it is responsible for certain reflexes, helps to process visual and auditory information, and contributes to the control of eye movement as well as other body movements.
• The pons (from the Latin for “bridge”) is a base for connections between different parts of the brain, including between the cerebellum and the cerebral cortex as well as between the cerebellum and the medulla. It contains the endpoints of several cranial nerves that link the face region and the brain.
• The medulla oblongata (or medulla) is the lowest part of the brain stem. It is important for the control of basic, involuntary functions including breathing, digestion, heart rate, and certain reflexes (such as the gag reflex and sneezing). It is directly joined with the spinal cord and helps to carry signals from the spine to the rest of the brain.

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Parts of the Brain: Anatomy, Structure & Functions

Olivia Guy-Evans, MSc

Associate Editor for Simply Psychology

BSc (Hons) Psychology, MSc Psychology of Education

Olivia Guy-Evans is a writer and associate editor for Simply Psychology. She has previously worked in healthcare and educational sectors.

Learn about our Editorial Process

Saul McLeod, PhD

Editor-in-Chief for Simply Psychology

BSc (Hons) Psychology, MRes, PhD, University of Manchester

Saul McLeod, PhD., is a qualified psychology teacher with over 18 years of experience in further and higher education. He has been published in peer-reviewed journals, including the Journal of Clinical Psychology.

On This Page:

The brain controls all functions of the body, interprets information from the outside world, and defines who we are as individuals and how we experience the world.

The brain receives information through our senses: sight, touch, taste, smell, and hearing. This information is processed in the brain, allowing us to give meaning to the input it receives.

The brain is part of the central nervous system ( CNS ) along with the spinal cord. There is also a peripheral nervous system (PNS) comprised of 31 pairs of spinal nerves that branch from the spinal cord and cranial nerves that branch from the brain.

Brain Parts

The brain is composed of the cerebrum, cerebellum, and brainstem (Fig. 1).

Figure 1. The brain has three main parts: the cerebrum, cerebellum, and brainstem.

The cerebrum is the largest and most recognizable part of the brain. It consists of grey matter (the cerebral cortex ) and white matter at the center. The cerebrum is divided into two hemispheres, the left and right, and contains the lobes of the brain (frontal, temporal, parietal, and occipital lobes).

The cerebrum produces higher functioning roles such as thinking, learning, memory, language, emotion, movement, and perception.

The Cerebellum

The cerebellum is located under the cerebrum and monitors and regulates motor behaviors, especially automatic movements.

This structure is also important for regulating posture and balance and has recently been suggested for being involved in learning and attention.

Although the cerebellum only accounts for roughly 10% of the brain’s total weight, this area is thought to contain more neurons (nerve cells) than the rest of the brain combined.

The brainstem is located at the base of the brain. This area connects the cerebrum and the cerebellum to the spinal cord, acting as a relay station for these areas.

The brainstem regulates automatic functions such as sleep cycles, breathing, body temperature, digestion, coughing, and sneezing.

Right Brain vs. Left Brain

The cerebrum is divided into two halves: the right and left hemispheres (Fig. 2). The left hemisphere controls the right half of the body, and the right hemisphere controls the left half.

The two hemispheres are connected by a thick band of neural fibers known as the corpus callosum, consisting of about 200 million axons.

The corpus callosum allows the two hemispheres to communicate and allows information being processed on one side of the brain to be shared with the other.

Figure 2. The cerebrum is divided into left and right hemispheres. The nerve fibers corpus callosum connects the two sides.

Hemispheric lateralization is the idea that each hemisphere is responsible for different functions. Each of these functions is localized to either the right or left side.

The left hemisphere is associated with language functions, such as formulating grammar and vocabulary and containing different language centers (Broca’s and Wernicke’s area).

The right hemisphere is associated with more visuospatial functions such as visualization, depth perception, and spatial navigation. These left and right functions are the case in most people, especially those who are right-handed.

Lobes of the Brain

Each cerebral hemisphere can be subdivided into four lobes, each associated with different functions.

The four lobes of the brain are the frontal, parietal, temporal, and occipital lobes (Figure 3).

Figure 3. The cerebrum is divided into four lobes: frontal, parietal, occipital, and temporal.

Frontal lobes

The frontal lobes are located at the front of the brain, behind the forehead (Figure 4).

Their main functions are associated with higher cognitive functions, including problem-solving, decision-making, attention, intelligence, and voluntary behaviors.

The frontal lobes contain the motor cortex  responsible for planning and coordinating movements.

It also contains the prefrontal cortex, which is responsible for initiating higher-lever cognitive functioning, and Broca’s Area, which is essential for language production.

Figure 4. Frontal lobe structure.

Temporal lobes

The temporal lobes are located on both sides of the brain, near the temples of the head, hence the name temporal lobes (Figure 5).

The main functions of these lobes include understanding, language, memory acquisition, face recognition, object recognition, perception, and auditory information processing.

There is a temporal lobe in both the left and right hemispheres. The left temporal lobe, which is usually the most dominant in people, is associated with language, learning, memorizing, forming words, and remembering verbal information.

The left lobe also contains a vital language center known as Wernicke’s area, which is essential for language development. The right temporal lobe is usually associated with learning and memorizing non-verbal information and determining facial expressions.

Figure 5. Temporal lobe structure.

Parietal lobes

The parietal lobe is located at the top of the brain, between the frontal and occipital lobes, and above the temporal lobes (Figure 6).

The parietal lobe is essential for integrating information from the body’s senses to allow us to build a coherent picture of the world around us.

These lobes allow us to perceive our bodies through somatosensory information (e.g., through touch, pressure, and temperature). It can also help with visuospatial processing, reading, and number representations (mathematics).

The parietal lobes also contain the somatosensory cortex, which receives and processes sensory information, integrating this into a representational map of the body.

This means it can pinpoint the exact area of the body where a sensation is felt, as well as perceive the weight of objects, shape, and texture.

Figure 6. Parietal lobe structure.

Occipital lobes

The occipital lobes are located at the back of the brain behind the temporal and parietal lobes and below the occipital bone of the skull (Figure 7).

The occipital lobes receive sensory information from the eyes’ retinas, which is then encoded into different visual data. Some of the functions of the occipital lobes include being able to assess the size, depth, and distance, determine color information, object and facial recognition, and mapping the visual world.

The occipital lobes also contain the primary visual cortex, which receives sensory information from the retinas, transmitting this information relating to location, spatial data, motion, and the colors of objects in the field of vision.

Figure 7. Occipital lobe structure.

Cerebral Cortex

The surface of the cerebrum is called the cerebral cortex  and has a wrinkled appearance, consisting of bulges, also known as gyri, and deep furrows, known as sulci (Figure 8).

A gyrus (plural: gyri) is the name given to the bumps and ridges on the cerebral cortex (the outermost layer of the brain). A sulcus (plural: sulci) is another name for a groove in the cerebral cortex.

Figure 8. The cortex contains neurons (grey matter) interconnected to other brain areas by axons (white matter). The cortex has a folded appearance. A fold is called a gyrus, and the valley between is a sulcus.

The cerebral cortex is primarily constructed of grey matter (neural tissue made up of neurons), with between 14 and 16 billion neurons found here.

The many folds and wrinkles of the cerebral cortex allow a wider surface area for an increased number of neurons to live there, permitting large amounts of information to be processed.

Deep Structures

The amygdala is a structure deep in the brain that is involved in the processing of emotions and fear learning. The amygdala is a part of the limbic system, a neural network that mediates emotion and memory (Figure 9).

This structure also ties emotional meaning to memories, processes rewards, and helps us make decisions. This structure has also been linked with the fight-or-flight response.

Figure 9. The amygdala in the limbic system plays a key role in how animals assess and respond to environmental threats and challenges by evaluating the emotional importance of sensory information and prompting an appropriate response.

Thalamus and Hypothalamus

The thalamus relays information between the cerebral cortex, brain stem, and other cortical structures (Figure 10).

Because of its interactive role in relaying sensory and motor information, the thalamus contributes to many processes, including attention, perception, timing, and movement. The hypothalamus modulates a range of behavioral and physiological functions.

It controls autonomic functions such as hunger, thirst, body temperature, and sexual activity. To do this, the hypothalamus integrates information from different brain parts and responds to various stimuli such as light, odor, and stress.

Figure 10. The thalamus is often described as the brain’s relay station as a great deal of information that reaches the cerebral cortex first stops in the thalamus before being sent to its destination.

Hippocampus

The hippocampus is a curved-shaped structure in the limbic system associated with learning and memory (Figure 11).

This structure is most strongly associated with the formation of memories, is an early storage system for new long-term memories, and plays a role in the transition of these long-term memories to more permanent memories.

Figure 11. Hippocampus location in the brain

Basal Ganglia

The basal ganglia are a group of structures that regulate the coordination of fine motor movements, balance, and posture alongside the cerebellum.

These structures are connected to other motor areas and link the thalamus with the motor cortex. The basal ganglia are also involved in cognitive and emotional behaviors, as well as playing a role in reward and addiction.

Figure 12. The Basal Ganglia Illustration

Ventricles and Cerebrospinal Fluid

Within the brain, there are fluid-filled interconnected cavities called ventricles , which are extensions of the spinal cord. These are filled with a substance called cerebrospinal fluid, which is a clear and colorless liquid.

The ventricles produce cerebrospinal fluid and transport and remove this fluid. The ventricles do not have a unique function, but they provide cushioning to the brain and are useful for determining the locations of other brain structures.

Cerebrospinal fluid circulates the brain and spinal cord and functions to cushion the brain within the skull. If damage occurs to the skull, the cerebrospinal fluid will act as a shock absorber to help protect the brain from injury.

As well as providing cushioning, the cerebrospinal fluid circulates nutrients and chemicals filtered from the blood and removes waste products from the brain. Cerebrospinal fluid is constantly absorbed and replenished by the ventricles.

If there were a disruption or blockage, this can cause a build-up of cerebrospinal fluid and can cause enlarged ventricles.

Neurons are the nerve cells of the central nervous system that transmit information through electrochemical signals throughout the body. Neurons contain a soma, a cell body from which the axon extends.

Axons are nerve fibers that are the longest part of the neuron, which conduct electrical impulses away from the soma.

There are dendrites at the end of the neuron, which are branch-like structures that send and receive information from other neurons.

A myelin sheath, a fatty insulating layer, forms around the axon, allowing nerve impulses to travel down the axon quickly.

There are different types of neurons. Sensory neurons transmit sensory information, motor neurons transmit motor information, and relay neurons allow sensory and motor neurons to communicate.

The communication between neurons is called synapses. Neurons communicate with each other via synaptic clefts, which are gaps between the endings of neurons.

During synaptic transmission, chemicals, such as neurotransmitters, are released from the endings of the previous neuron (also known as the presynaptic neuron).

These chemicals enter the synaptic cleft to then be transported to receptors on the next neuron (also known as the postsynaptic neuron).

Once transported to the next neuron, the chemical messengers continue traveling down neurons to influence many functions, such as behavior and movement.

Glial Cells

Glial cells are non-neuronal cells in the central nervous system which work to provide the neurons with nourishment, support, and protection.

These are star-shaped cells that function to maintain the environment for neuronal signaling by controlling the levels of neurotransmitters surrounding the synapses.

They also work to clean up what is left behind after synaptic transmission, either recycling any leftover neurotransmitters or cleaning up when a neuron dies.

Oligodendrocytes

These types of glial have the appearance of balls with spikes all around them. They function by wrapping around the axons of neurons to form a protective layer called the myelin sheath.

This is a substance that is rich in fat and provides insulation to the neurons to aid neuronal signaling.

Microglial cells have oval bodies and many branches projecting out of them. The primary function of these cells is to respond to injuries or diseases in the central nervous system.

They respond by clearing away any dead cells or removing any harmful toxins or pathogens that may be present, so they are, therefore, important to the brain’s health.

Ependymal cells

These cells are column-shaped and usually line up together to form a membrane called the ependyma. The ependyma is a thin membrane lining the spinal cord and ventricles of the brain .

In the ventricles, these cells have small hairlike structures called cilia, which help encourage the flow of cerebrospinal fluid.

Cranial Nerves

There are 12 types of cranial nerves which are linked directly to the brain without having to pass through the spinal cord. These allow sensory information to pass from the organs of the face to the brain:

Mnemonic for Order of Cranial Nerves:

S ome S ay M arry M oney B ut M y B rother S ays B ig B rains M atter M ore

• Cranial I: Sensory
• Cranial II: Sensory
• Cranial III: Motor
• Cranial IV: Motor
• Cranial V: Both (sensory & motor)
• Cranial VI: Motor
• Cranial VII: Both (sensory & motor)
• Cranial VIII: Sensory
• Cranial IX: Both (sensory & motor)
• Cranial X: Both (sensory & motor)
• Cranial XI: Motor
• Cranial XII: Motor

Purves, D., Augustine, G., Fitzpatrick, D., Katz, L., LaMantia, A., McNamara, J., & Williams, S. (2001). Neuroscience 2nd edition . sunderland (ma) sinauer associates. Types of Eye Movements and Their Functions.

Mayfield Brain and Spine (n.d.). Anatomy of the Brain. Retrieved July 28, 2021, from: https://mayfieldclinic.com/pe-anatbrain.htm

Robertson, S. (2018, August 23). What is Grey Matter? News Medical Life Sciences. https://www.news-medical.net/health/What-is-Grey-Matter.aspx

Guy-Evans, O. (2021, April 13). Temporal lobe: definition, functions, and location. Simply Psychology. www.www.www.www.www.www.simplypsychology.org/temporal-lobe.html

Guy-Evans, O. (2021, April 15). Parietal lobe: definition, functions, and location. Simply Psychology. www.www.www.www.www.www.simplypsychology.org/parietal-lobe.html

Guy-Evans, O. (2021, April 19). Occipital lobe: definition, functions, and location. Simply Psychology. www.www.www.www.www.www.simplypsychology.org/occipital-lobe.html

Guy-Evans, O. (2021, May 08). Frontal lobe function, location in brain, damage, more. Simply Psychology. www.www.www.www.www.www.simplypsychology.org/frontal-lobe.html

Guy-Evans, O. (2021, June 09). Gyri and sulci of the brain. Simply Psychology. www.www.www.www.www.www.simplypsychology.org/gyri-and-sulci-of-the-brain.html

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Disorder: something that is not in order. Not arranged correctly. In medicine a disorder is when something in the body is not working correctly.

Electroencephalogram: visual recording showing the electrical activity of the brain (EEG)...  more

Emotion: any of a long list of feelings a person can have such as joy, anger and love...  more

What Are the Regions of the Brain and What Do They Do?

The brain has many different parts . The brain also has specific areas that do certain types of work. These areas are called lobes. One lobe works with your eyes when watching a movie. There is a lobe that is controlling your legs and arms when running and kicking a soccer ball. There are two lobes that are involved with reading and writing. Your memories of a favorite event are kept by the same lobe that helps you on a math test. The brain is controlling all of these things and a lot more. Use the map below to take a tour of the regions in the brain and learn what they control in your body.

The brain is a very busy organ. It is the control center for the body. It runs your organs such as your heart and lungs. It is also busy working with other parts of your body. All of your senses  –  sight, smell, hearing, touch, and taste  –  depend on your brain. Tasting food with the sensors on your tongue is only possible if the signals from your taste buds are sent to the brain. Once in the brain, the signals are decoded. The sweet flavor of an orange is only sweet if the brain tells you it is.

Brain Waves

How do you tell if the brain is working? What is it doing and how do you measure it? The head gear on the right that looks like it's from a work of science fiction measures electrical activity in the brain. These electrical waves are called brain waves.

When neurons send a signal they use electrical currents to pass messages to other nearby neurons. Just one or two neurons signaling is too small a change to be noticed. When a huge group of neurons signal at once, however, they can be recorded and measured with the help of special tools.

Measuring electrical activity in the brain is usually done with electrodes. Electrodes are devices able to record electrical changes over time. These are attached to the surface of the skin in specific places around the head. Recordings of brain wave activity look like a series of waves. These are called electroencephalograms, or EEGs for short.

Measuring activity in the brain can be a very useful tool in scientific studies. They can also be used to help identify sleeping disorders and other medical conditions relating to the brain.

The first human electroencephalogram, recorded in 1924 by Hans Berger.

Computer animation credit: BodyParts3D, Copyright© 2010 The Database Center for Life Science licensed under CC Attribution-Share Alike 2.1 Japan.

Read more about: A Nervous Journey

View citation, bibliographic details:.

• Article: What's Your Brain Doing?
• Author(s): Brett Szymik
• Publisher: Arizona State University School of Life Sciences Ask A Biologist
• Site name: ASU - Ask A Biologist
• Date published: May 9, 2011
• Date accessed: August 28, 2024
• Link: https://askabiologist.asu.edu/brain-regions

Brett Szymik. (2011, May 09). What's Your Brain Doing?. ASU - Ask A Biologist. Retrieved August 28, 2024 from https://askabiologist.asu.edu/brain-regions

Chicago Manual of Style

Brett Szymik. "What's Your Brain Doing?". ASU - Ask A Biologist. 09 May, 2011. https://askabiologist.asu.edu/brain-regions

MLA 2017 Style

Brett Szymik. "What's Your Brain Doing?". ASU - Ask A Biologist. 09 May 2011. ASU - Ask A Biologist, Web. 28 Aug 2024. https://askabiologist.asu.edu/brain-regions

Computer animation image of the human brain. The colors show the frontal lobe (red), parietal lobe (orange), temporal lobe (green), and occipital lobe (yellow).

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January 25, 2008

What Are We Thinking When We (Try to) Solve Problems?

New research indicates what happens in the brain when we're faced with a dilemma

By Nikhil Swaminathan

Aha! Eureka! Bingo! "By George, I think she's got it!" Everyone knows what it's like to finally figure out a seemingly impossible problem. But what on Earth is happening in the brain while we're driving toward mental pay dirt ? Researchers eager to find out have long been on the hunt, knowing that such information could one day provide priceless clues in uncovering and fixing faulty neural systems believed to be behind some mental illnesses and learning disabilities.

Researchers at Goldsmiths, University of London report in the journal PLoS ONE that they monitored action in the brains of 21 volunteers with electroencephalography (EEG) as they tackled verbal problems in an attempt to uncover what goes through the mind—literally—in order to observe what happens in the brain during an "aha!" moment of problem solving.

"This insight is at the core of human intelligence … this is a key cognitive function that the human can boast to have," says Joydeep Bhattacharya, an assistant professor in Goldsmiths's psychology department. "We're interested [in finding out] whether—there is a sudden change that takes place or something that changes gradually [that] we're not consciously aware of," he says. The researchers believed they could pin down brain signals that would enable them to predict whether a person could solve a particular problem or not.

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In many cases, the subjects hit a wall, or what researchers refer to as a "mental impasse." If the participants arrived at this point, they could press a button for a clue to help them untangle a problem. Bhattacharya says blocks correlated with strong gamma rhythms (a pattern of brain wave activity associated with selective attention) in the parietal cortex, a region in the upper rear of the brain that has been implicated in integrating information coming from the senses. The research team noticed an interesting phenomenon taking place in the brains of participants given hints: The clues were less likely to help if subjects had an especially high gamma rhythm pattern. The reason, Bhattacharya speculates, is that these participants were, in essence, locked into an inflexible way of thinking and less able to free their minds, and thereby unable to restructure the problem before them.

"If there's excessive attention, it somehow creates mental fixation," he notes. "Your brain is not in a receptive condition."

At the end of each trial, subjects reported whether or not they had a strong "Aha!" moment. Interestingly, researchers found that subjects who were aware that they had found a new way to tackle the problem (and so, had consciously restructured their thinking) were less likely to feel as if they'd had eureka moment compared to more clueless candidates.

"People experience the "Aha!" feeling when they are not consciously monitoring what they are thinking," Bhattacharya says, adding that the sentiment is more of an emotional experience he likens to relief. "If you're applying your conscious brain information processing ability, then you're alpha." (Alpha brain rhythms are associated with a relaxed and open mind; volunteers who unwittingly solved problems showed more robust alpha rhythms than those who knowingly adjusted their thinking to come up with the answer.)

He says the findings indicate that it's better to tackle problems with an open mind than by concentrating too hard on them. In the future, Bhattacharya says, his team will attempt to predict in real-time whether a stumped subject will be able to solve a vexing problem and, also, whether they can manipulate brain rhythms to aid in finding a solution.

The second probe into problem-solving focused on the anterior cingulate cortex (ACC), a region in the front of the brain tied to functions such as decision making, conflict monitoring and reward feedback. A team at the University of Lyon's Stem Cell and Brain Research Institute in Bron, France reports in Neuron that it verified that the ACC helps detect errors during problem solving (as previously discovered), but also that it does so by acting more as a general guide, monitoring and scoring the steps involved in problem solving, pointing out miscalculations as well as success.

The team discovered this by recording electrical activity in the brains of two male rhesus monkeys as they tried to determine which targets on a screen would result in a tasty drink of juice. "When you're trying to solve a problem, you need to search; when you discover the solution, you need to stop searching," says study co-author Emmanuel Procyk, coordinator of the Institute's Department of Integrative Neurobiology. "We need brain areas to do that."

He says that researchers observed increased neuronal activity in the animals' ACCs when they began searching. When the monkeys hit the jackpot, there was still heightened activity in the ACC (though only a selective population of nerve cells remained hopped up), indicating that the region is responsible for more than simply alerting the rest of the brain when errors are made. Once the monkeys got the hang of it—and routinely pressed the correct target—ACC activity slowed.

"What we think based on this experiment and other experiments," Procyk says, "is that this structure is very important in valuing things." It essentially scores each of the monkey's behaviors as successful or not successful. "It is an area," he adds, "that will help to decide when to shift from the functioning that goes on when [the brain is] learning to when the learning [is] done."

Procyk says that if this system is compromised, it could have implications for issues such as drug dependency. If the ACC is functioning abnormally, he says, it could overvalue drugs, leading to addiction. (Other studies have shown that an impaired cingulate cortex can result in maladaptive social behavior and disrupted cognitive abilities.)

Alas, the ultimate "Aha!" moment for researchers probing problem solving is likely is far off, but at least the latest research may help them avoid an impasse.

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What Your Brain Looks Like When It Solves a Math Problem

By Benedict Carey

• July 28, 2016

Solving a hairy math problem might send a shudder of exultation along your spinal cord. But scientists have historically struggled to deconstruct the exact mental alchemy that occurs when the brain successfully leaps the gap from “Say what?” to “Aha!”

Now, using an innovative combination of brain-imaging analyses, researchers have captured four fleeting stages of creative thinking in math. In a paper published in Psychological Science, a team led by John R. Anderson, a professor of psychology and computer science at Carnegie Mellon University, demonstrated a method for reconstructing how the brain moves from understanding a problem to solving it, including the time the brain spends in each stage.

The imaging analysis found four stages in all: encoding (downloading), planning (strategizing), solving (performing the math), and responding (typing out an answer).

“I’m very happy with the way the study worked out, and I think this precision is about the limit of what we can do” with the brain imaging tools available, said Dr. Anderson, who wrote the report with Aryn A. Pyke and Jon M. Fincham, both also at Carnegie Mellon.

To capture these quicksilver mental operations, the team first taught 80 men and women how to interpret a set of math symbols and equations they had not seen before. The underlying math itself wasn’t difficult, mostly addition and subtraction, but manipulating the newly learned symbols required some thinking. The research team could vary the problems to burden specific stages of the thinking process — some were hard to encode, for instance, while others extended the length of the planning stage.

The scientists used two techniques of M.R.I. data analysis to sort through what the participants’ brains were doing. One technique tracked the neural firing patterns during the solving of each problem; the other identified significant shifts from one kind of mental state to another. The subjects solved 88 problems each, and the research team analyzed the imaging data from those solved successfully.

The analysis found four separate stages that, depending on the problem, varied in length by a second or more. For instance, planning took up more time than the other stages when a clever workaround was required. The same stages are likely applicable to solving many creative problems, not just in math. But knowing how they play out in the brain should help in designing curriculums, especially in mathematics, the paper suggests.

“We didn’t know exactly what students were doing when they solved problems,” said Dr. Anderson, whose lab designs math instruction software. “Having a clearer understanding of that will help us develop better instruction; I think that’s the first place this work will have some impact.”

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Mapping the Brain

• Published 1 Apr 2012
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The cerebrum, the largest part of the human brain, is associated with higher order functioning, including the control of voluntary behavior. Thinking, perceiving, planning, and understanding language all lie within the cerebrum’s control.

The top image shows the four main sections of the cerebral cortex: the frontal lobe, the parietal lobe, the occipital lobe, and the temporal lobe. Functions such as movement are controlled by the motor cortex, and the sensory cortex receives information on vision, hearing, speech, and other senses. The bottom image shows the location of the brain's major internal structures.

The cerebrum is divided into two hemispheres — the right hemisphere and the left hemisphere. Bridging the two hemispheres is a bundle of fibers called the corpus callosum. The two hemispheres communicate with one another across the corpus callosum.

Covering the outermost layer of the cerebrum is a sheet of tissue called the cerebral cortex. Because of its gray color, the cerebral cortex is often referred to as gray matter. The wrinkled appearance of the human brain also can be attributed to characteristics of the cerebral cortex. More than two-thirds of this layer is folded into grooves. The grooves increase the brain’s surface area, allowing for inclusion of many more neurons.

The function of the cerebral cortex can be understood by dividing it somewhat arbitrarily into zones, much like the geographical arrangement of continents.

The frontal lobe is responsible for initiating and coordinating motor movements; higher cognitive skills, such as problem solving, thinking, planning, and organizing; and for many aspects of personality and emotional makeup.

The parietal lobe is involved with sensory processes, attention, and language. Damage to the right side of the parietal lobe can result in difficulty navigating spaces, even familiar ones. If the left side is injured, the ability to understand spoken and/or written language may be impaired.

The occipital lobe helps process visual information, including recognition of shapes and colors.

The temporal lobe helps process auditory information and integrate information from the other senses. Neuroscientists also believe that the temporal lobe has a role to play in short-term memory through its hippocampal formation, and in learned emotional responses through its amygdala.

All of these structures make up the forebrain. Other key parts of the forebrain include the basal ganglia, which are cerebral nuclei deep in the cerebral cortex; the thalamus; and the hypothalamus. The cerebral nuclei help coordinate muscle movements and reward useful behaviors; the thalamus passes most sensory information on to the cerebral cortex after helping to prioritize it; and the hypothalamus is the control center for appetites, defensive and reproductive behaviors, and sleep-wakefulness.

The midbrain consists of two pairs of small hills called colliculi. These collections of neurons play a critical role in visual and auditory reflexes and in relaying this type of information to the thalamus. The midbrain also has clusters of neurons that regulate activity in widespread parts of the central nervous system and are thought to be important for reward mechanisms and mood.

The hindbrain includes the pons and the medulla oblongata, which control respiration, heart rhythms, and blood glucose levels.

Another part of the hindbrain is the cerebellum which, like the cerebrum, also has two hemispheres. The cerebellum’s two hemispheres help control movement and cognitive processes that require precise timing, and also play an important role in Pavlovian learning.

The spinal cord is the extension of the brain through the vertebral column. It receives sensory information from all parts of the body below the head. It uses this information for reflex responses to pain, for example, and it also relays the sensory information to the brain and its cerebral cortex. In addition, the spinal cord generates nerve impulses in nerves that control the muscles and the viscera, both through reflex activities and through voluntary commands from the cerebrum.

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How the Brain Combines Memories to Solve Problems

Summary: Using AI technology, researchers provide new insight into how the human brain connects individual episodic memories to help solve problems.

Source: Cell Press.

Humans have the ability to creatively combine their memories to solve problems and draw new insights, a process that depends on memories for specific events known as episodic memory. But although episodic memory has been extensively studied in the past, current theories do not easily explain how people can use their episodic memories to arrive at these novel insights.

Results from a team of neuroscientists and artificial intelligence researchers at DeepMind, Otto von Guericke University Magdeburg and the German Center for Neurodegenerative Diseases (DZNE), publishing in the journal Neuron on September 19, provide a window into the way the human brain connects individual episodic memories to solve problems.

For example, imagine you see a woman driving a car on your street. The next day, you see a man driving the exact same car on your street. This might trigger the memory of the woman you saw the day before, and you might reason that the pair live together, given that they share a car.

The researchers propose a novel brain mechanism that would allow retrieved memories to trigger the retrieval of further, related memories in this way. This mechanism allows the retrieval of multiple linked memories, which then enable the brain to create new kinds of insights like these.

In common with standard theories of episodic memory, the authors posit that individual memories are stored as separate memory traces in a brain region called the hippocampus.

“Episodic memories can tell you whether you have met someone before, or where you parked your car,” says Raphael Koster (@raphael_koster), a researcher at DeepMind (@DeepMindAI). “The hippocampal system supports this type of memory, which is crucial for rapid learning.”

Unlike standard theories, the new theory explores a neglected anatomical connection that loops out of the hippocampus to the neighboring entorhinal cortex but then immediately passes back in. It is this recurrent connection, the researchers thought, that allows memories retrieved from the hippocampus to trigger the retrieval of further, related memories.

The researchers devised a way of testing this theory by taking high-resolution 7-Tesla functional MRI scans from 26 young men and women as they performed a task that required them to draw insights across separate events.

The volunteers were shown pairs of photographs: one of a face and one of an object or a place. Each individual object and place appeared in two separate photo pairs, each of which included a different face. This meant that every photo pair was linked with another pair through the shared object or place image.

In a second phase of the experiment, the researchers tested whether the participants could infer the indirect connection between these linked pairs of photos by showing one face and asking the participants to choose between two other faces. One of the choices–the correct one–had been paired with the same object or place image, and one had not.

The researchers guessed that the presented face would trigger the retrieval of the paired object or place and thus spark brain activity that would pass out of the hippocampus into the entorhinal cortex. Crucially, the researchers also expected to see evidence that this activity would then pass back into the hippocampus to trigger the retrieval of the correct linked face.

“Using specialized techniques developed in our lab in Magdeburg, we were able to separate out the parts of the entorhinal cortex that provide the input to the hippocampus,” says Yi Chen, researcher at Otto von Guericke University. “This allowed us to precisely measure the patterns of activation in the hippocampus input and output separately.”

The researchers trained a computer algorithm to distinguish between activation for scenes and objects within these input and output regions. The algorithm was then applied when only faces were displayed on the screen. If the algorithm indicated the presence of scene or object information on these trials, it could only be driven by retrieved memories of the linked scene or object photos.

“Our data showed that when the hippocampus retrieves a memory, it doesn’t just pass it to the rest of the brain,” says DeepMind’s Dharshan Kumaran (@dharshsky). “Instead, it recirculates the activation back into the hippocampus, triggering the retrieval of other related memories.”

The researchers think of the algorithm’s results as a synthesis of new and old theories.

“The results could be thought of as the best of both worlds: you preserve the ability to remember individual experiences by keeping them separate, while at the same time allowing related memories to be combined on the fly at the point of retrieval,” says Kumaran. “This ability is useful for understanding how the different parts of a story fit together, for example–something not possible if you just retrieve a single memory.”

The authors believe that their results could help AI learn faster in the future.

“While there are many domains where AI is superior, humans still have an advantage when tasks depend on the flexible use of episodic memory,” says Martin Chadwick (@MartinJChadwick), another researcher at DeepMind. “If we can understand the mechanisms that allow people to do this, the hope is that we can replicate them within our AI systems, providing them with a much greater capacity for rapidly solving novel problems.”

Funding: This research was funded by DeepMind and the German Research foundation.

Source: Erin Kohnke – Cell Press Publisher: Organized by NeuroscienceNews.com. Image Source: NeuroscienceNews.com image is in the public domain. Original Research: Open access research for “Big-Loop Recurrence within the Hippocampal System Supports Integration of Information across Episodes” by Raphael Koster, Martin J. Chadwick, Yi Chen, David Berron, Andrea Banino, Emrah Düzel, Demis Hassabis, and Dharshan Kumaran in Neuron . Published September 19 2018. doi: 10.1016/j.neuron.2018.08.009

[cbtabs][cbtab title=”MLA”]Cell Press”How the Brain Combines Memories to Solve Problems.” NeuroscienceNews. NeuroscienceNews, 19 September 2018. <https://neurosciencenews.com/memory-problem-solving-9891/>.[/cbtab][cbtab title=”APA”]Cell Press(2018, September 19). How the Brain Combines Memories to Solve Problems. NeuroscienceNews . Retrieved September 19, 2018 from https://neurosciencenews.com/memory-problem-solving-9891/[/cbtab][cbtab title=”Chicago”]Cell Press”How the Brain Combines Memories to Solve Problems.” https://neurosciencenews.com/memory-problem-solving-9891/ (accessed September 19, 2018).[/cbtab][/cbtabs]

Big-Loop Recurrence within the Hippocampal System Supports Integration of Information across Episodes

Recent evidence challenges the widely held view that the hippocampus is specialized for episodic memory, by demonstrating that it also underpins the integration of information across experiences. Contemporary computational theories propose that these two contrasting functions can be accomplished by big-loop recurrence, whereby the output of the system is recirculated back into the hippocampus. We use ultra-high-resolution fMRI to provide support for this hypothesis, by showing that retrieved information is presented as a new input on the superficial entorhinal cortex—driven by functional connectivity between the deep and superficial entorhinal layers. Further, the magnitude of this laminar connectivity correlated with inferential performance, demonstrating its importance for behavior. Our findings offer a novel perspective on information processing within the hippocampus and support a unifying framework in which the hippocampus captures higher-order structure across experiences, by creating a dynamic memory space from separate episodic codes for individual experiences.

Love to read about developments in the interests of all people. Wish that scientists took a firmer stance against the militarization of our lives.

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How Much Is 2 × 4? Understanding How the Brain Solves Arithmetic Problems

How much is 2 × 4? Sounds like an easy question, but have you ever thought about how you solve that problem? In this article you will learn about two different strategies that we use to solve arithmetic problems. You will also get to know the different brain areas—like the intraparietal sulcus—that work together when you use these different strategies. Which strategy and which brain regions you use changes over time as you get more familiar with arithmetic. This transition is especially visible in the way brain areas work and communicate with one another—some areas become more active, while others become less active. After reading this article, you will know more about the techniques we use to solve arithmetic problems and the brain areas needed to find the answers for your next math homework assignment.

Introduction

Because math is one of the most important skills to master, understanding how arithmetic problems are solved can have a very big impact. Not only do you need math every day at school, but also as a grown-up. If you want to become a programmer, an engineer, or a scientist, you will deal with numbers on a daily basis. Because math is important in almost every job, people who are not good at math sometimes have a hard time finding a job. Some of them might even suffer from something called developmental dyscalculia . Therefore, understanding what happens in the brain when you calculate can be very helpful for kids who struggle with math. Understanding the reason for these difficulties enables teachers to structure their lessons in a way that allows children to learn more easily. And of course, just being curious about how things work is always reason enough to conduct an experiment!

Are There Different Ways to Solve an Arithmetic Problem?

To study arithmetic, children and adults are usually asked to solve arithmetic problems as fast and accurately as they can. The problems are usually presented on a computer screen, one after the other (see Figure 1 ). Once the participant provides an answer, the next problem appears. To study the different strategies that we use during arithmetic, scientists usually use a mix of different arithmetic operations of varying difficulty.

• Figure 1 - Example setup for a study investigating arithmetic problem solving.
• Participants are presented with an arithmetic problem on a computer screen. Once the answer is given, a new problem appears. For each problem, researchers record the time it took to solve the problem (speed) and if the answer was correct (accuracy).

Using these methods, scientists found that arithmetic problems can be divided into two categories: small and large problems. Small problems are solved very quickly, and participants make fewer errors when solving these problems. A good example would be “2 × 4.” Large problems are usually a bit harder to solve. Participants take longer to solve these problems and also make more errors. A good example would be “12 × 3.” Scientists sometimes disagree on where to draw the line between small and large problems. How hard it is to solve a problem depends on your age and ability. However, speed and error differences between small and large problems suggest that we use two main strategies to solve them [ 2 ].

The first strategy, calculating the answer, is often used with large problems. It is called procedural strategy, because coming up with the answer involves multiple steps—or multiple procedures. For example, to solve “12 × 3” you might split the problem into two easier ones like “10 × 3 = 30” and “2 × 3 = 6.” Afterwards, you can add up the results to get the answer “36.” But adding extra steps has its downsides. It takes more time and each step also increases the chance of making errors. You do not, however, use the same strategy to solve the same problem forever. After solving it multiple times, the correct answer will 1 day just pop into your head. This shows that the way you solve this problem has changed.

Now you are using the second strategy: knowing the answer by heart—often called fact retrieval. By practicing the same problem multiple times, you stored its answer in your long-term memory. The switch from using procedural strategies to using fact retrieval is an important step during the development of arithmetic abilities [ 3 ]. Instead of calculating the answer, you are now able to remember it. Additionally, by becoming better at solving easier problems, you are also becoming better at solving more difficult problems. To better understand these changes, we need to look inside our brain while it solves arithmetic problems. To do so, scientists use different tools, such as electroencephalography (EEG) and functional magnetic resonance imaging (fMRI, see Figure 2 ).

• Figure 2 - Children taking part in one of our functional Magnetic Resonance Imaging (fMRI, left) and Electroencephalography (EEG, right) studies.
• These two tools let scientists study the brain while it is working.

Which Brain Areas Are Involved in Solving Arithmetic Problems?

Trying to understand how the brain works can sometimes feel like solving a complicated puzzle. Similar to the way a puzzle is made up of different pieces, your brain is made up of different brain areas (see Figure 3 ). Understanding each brain area’s function will give you a clearer picture of how it fits into the puzzle.

• Figure 3 - In this figure you can see a number of brain areas and one connection that are important for arithmetic.
• Two of them are in the frontal cortex (red) and two are in the parietal cortex (yellow). How they work together when you calculate depends on your age and your ability. Another important brain area, the hippocampus, is in the very center of your brain and therefore hidden from view.

The first piece of the puzzle is the intraparietal sulcus. It is located in the parietal cortex and is responsible for understanding the meaning of numbers [ 4 ]. The first step when solving an arithmetic problem is to understand a number’s magnitude. For example, you have to know that “4 dogs” are more than “2 dogs.” You also need to understand the order of numbers (i.e., “1” comes before “2,” that “2” comes before “3,” and so on). While calculating, you use your understanding of magnitude and order to find the correct solution.

The next pieces of the puzzle involve three brain areas in the frontal cortex. The ventrolateral prefrontal cortex works with regions in the parietal cortex to blend out distractions, such as daydreaming about your next bike ride with your friends. The dorsolateral prefrontal cortex is needed to manipulate numbers, like splitting up a large problem into easier steps. The inferior frontal gyrus has been found to play an important role in ignoring similar but incorrect answers [ 5 ].

The last pieces in our puzzle are the hippocampus and the angular gyrus. The hippocampus is located deep inside your brain. It plays an important role in storing arithmetic facts [ 6 ]. The hippocampus is the “save” button of your brain. When it comes to math, it works with the frontal cortex to help you store the answers of arithmetic problems as arithmetic facts in your long-term memory. The angular gyrus is then involved in finding these facts when you solve arithmetic problems.

How Does Solving Arithmetic Problems Change As You Get Older?

Have you and your friends ever worked on a challenging puzzle together? If so, you probably worked together to solve it. Your brain works in a similar way. Different brain regions work together when solving a problem. The last piece in our puzzle is understanding how these brain areas work together when you calculate. As you now know, the way you solve arithmetic problems changes as you get older. Instead of mostly using procedural strategies to solve arithmetic problems, you start using fact retrieval more often. But this is not the only thing that changes. Scientists found that during this process the way the different brain areas work together changes as well. For example, while you are young, the frontal cortex has a very important role. It manages your working memory and attention, because the way you solve arithmetic problems involves multiple steps (procedural strategies). As you get older and start to use fact retrieval, the role of your frontal cortex changes. When you look at the frontal cortex using fMRI or EEG, you can see that it becomes less active as you get older. It is still involved in the process of finding the right answer, but it does not have to work as hard as before. Maybe you have experienced something similar when cooperating with your friends. At first, one of you might have had to keep an eye on everyone’s progress and give instructions what to do next (similar to the frontal cortex). After you have successfully solved a few puzzles together, you will be able to work together without needing someone to always check on the progress. The role of the hippocampus changes too. During fact retrieval it is more active in young children than in adults [ 7 ]. This is because when you are young, the hippocampus is still working hard to save the answers to arithmetic problems to your long-term memory. As you get older your hippocampus has to work less and less, because you come across fewer new answers that have to be saved.

All of the brain areas work together by communicating with one another. This communication happens over a wide network of pathways (called white matter) that connect all brain areas. These networks are similar to the way in which roads connect different cities. One of these roads in the brain is called the superior longitudinal fasciculus. This road connects the prefrontal cortex with the parietal cortex (where the IPS is located) [ 8 ]. Because different brain regions are involved in the process of solving arithmetic problems at certain points in your life, the connections between these regions change as well. Scientists are still trying to fully understand how and why these connections change as you get older. That means, even though we already know a lot about how you solve arithmetic problems, we still need to do more research to complete the puzzle of the calculating brain.

Even if it sounds like a simple process at first, solving an arithmetic problem actually involves many steps. Not only that, but as you get older you use different strategies to solve them. Almost every part involved in your brain changes. At first, many brain areas work together to solve an arithmetic problem. Some parts keep you focused on the task, others keep track and memorize the results of your calculations. The hippocampus saves the correct result in your long-term memory. As you get older, you only need a few specialized brain areas to solve the same problem. Your brain now works very efficiently. Next time you do your math homework, take a minute to think of all the different brain areas that are involved!

Developmental Dyscalculia : ↑ Is a difficulty in learning or understanding arithmetic. For a good overview look at the Young Minds article; When your brain cannot do 2 + 2: a case of developmental dyscalculia [ 1 ].

Electroence-phalography (EEG) : ↑ A neuroscientific tool to measure the electrical signals a brain produces. This method can tell us with high accuracy at what time point brain areas are performing a specific task.

Functional Magnetic Resonance Imaging (fMRI) : ↑ A tool to measure oxygen differences in the brain. Because active areas need more oxygen during a task, we can tell with high accuracy which parts are doing the job.

Brain Areas : ↑ The brain can be divided into four major parts: the frontal cortex, the parietal cortex, the temporal cortex, and the occipital cortex. Each cortex contains brain areas with unique functions.

Working Memory : ↑ A crucial function of your brain. Similar to the working memory of a computer, it stores information in your mind in order to work with it when you need it.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

We would like to wholeheartedly thank those who assisted in the translation of the articles in this Collection to make them more accessible to kids outside English-speaking countries, and for the Jacobs Foundation for providing the funds necessary to translate the articles. For this article, we would especially like to thank Nienke van Atteveldt and Sabine Peters for the Dutch translation.

[1] ↑ Bugden, S., and Ansari, D. 2014. When your brain cannot do 2 + 2: a case of developmental dyscalculia. Front. Young Minds 2:8. doi: 10.3389/frym.2014.00008

[2] ↑ Siegler, R. S. 1996. Emerging Minds: The Process of Change in Children’s Thinking . New York, NY: Oxford University Press. doi: 10.5860/choice.34-5984

[3] ↑ De Smedt, B. 2016. “Individual differences in arithmetic fact retrieval,” in Mathematical Cognition and Learning , eds D. B. Berch, D. C. Geary, and K. M. Koepke (San Diego, CA: Academic Press). p. 219–43. doi: 10.1016/B978-0-12-801871-2.00009-5

[4] ↑ Vogel, S. E., Goffin, C., and Ansari, D. 2015. Developmental specialization of the left parietal cortex for the semantic representation of Arabic numerals: an fMR-adaptation study. Dev. Cogn. Neurosci . 12, 61–73. doi: 10.1016/j.dcn.2014.12.001

[5] ↑ De Visscher, A., Vogel, S. E., Reishofer, G., Hassler, E., Koschutnig, K., De Smedt, B., et al. 2018. Interference and problem size effect in multiplication fact solving: individual differences in brain activations and arithmetic performance. Neuroimage 15:718–27. doi: 10.1016/j.neuroimage.2018.01.060

[6] ↑ Qin, S., Cho, S., Chen, T., Rosenberg-Lee, M., Geary, D. C., and Menon, V. 2014. Hippocampal-neocortical functional reorganization underlies children’s cognitive development. Nat. Neurosci. 17:1263–9. doi: 10.1038/nn.3788

[7] ↑ Cho, S., Metcalfe, A. W. S., Young, C. B., Ryali, S., Geary, D. C., and Menon, V. 2012. Hippocampal–prefrontal engagement and dynamic causal interactions in the maturation of children’s fact retrieval. J. Cogn. Neurosci. 24:1849–66. doi: 10.1162/jocn_a_00246

[8] ↑ Matejko, A. A., and Ansari, D. 2015. Drawing connections between white matter and numerical and mathematical cognition: a literature review. Neurosci. Biobehav. Rev. 1:35–52. doi: 10.1016/j.neubiorev.2014.11.006

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Strategies to Improve Your Problem-Solving Skills

Got problems? We all do.

They’re something we encounter daily, both at work and at home. Tackling problems and finding solutions are useful skills that are in high demand.

At a basic level, there are three steps to solving any problem:

• Define the problem
• Generate ideas for solutions
• Implement solutions

You might be tempted to think that the first step is unnecessary. After all, that’s why you’re here in the first place, to solve a problem. However, defining the problem is arguably the most important step in problem-solving.

Albert Einstein is famously quoted as saying, “If I had an hour to solve a problem I’d spend 55 minutes thinking about the problem and 5 minutes thinking about solutions.”

When you can spend more time defining the real problem, and not just a symptom, it will be easier to find a lasting solution.

How to better define the problem:

• Ask “why” questions
• Talk it through with others
• Write down the problem in words
• Use graphs or flow charts

Now that we’ve talked about the steps of solving a problem and how to better define it, let’s dig into some strategies to help your brain perform at its best for solving problems.

“Thanks to a process called neuroplasticity, your brain is continually reorganizing itself by forming new neural connections throughout your life, which gives you the power to make your brain better.” – Daniel G. Amen, MD

Neuroplasticity enables your brain to continue to learn and grow throughout your life. Like your muscles, your brain needs exercise to become stronger. Becoming a life-long learner will not only strengthen your brain, but also sharpen your memory, boost confidence, and bring new knowledge and skills into your life.

3 Ways to Improve Your Problem-Solving Skills

1.    Regularly Engage in Brain Boosting Activities

There are a number of easy and fun ways to strengthen your brain. Adding one or more of these activities into your daily routines can help boost your brain and result in better problem-solving abilities.

• Work on a jigsaw puzzle – Puzzles can be done on your own, or as a social activity. Putting together a puzzle requires concentration and spatial awareness, activating multiple parts of the brain and improving short-term memory.
• Play a musical instrument – Research has shown that learning to play an instrument can improve neuroplasticity and help improve your memory. Playing music engages multiple regions of the brain, providing numerous benefits. Maybe it’s been a while since you last played, or maybe you’ve never learned an instrument. Either way, it’s never too late to tap into your musical side and begin making music.
• Try a new hobby – Remember the “use it or lose it” concept when it comes to the brain. It’s recommended to never stop learning new things. Challenge yourself, no matter your age! Trying new hobbies is a great mental exercise to sharpen your brain. You also may find a new activity that brings more joy to your life.
• Meditate – The practice of meditation has been around for thousands of years as a tool for reducing stress, clearing your mind, promoting relaxation, and improving focus. Meditation is a powerful tool that can boost your brain anytime, anywhere.
• Play brain games – Chess, crossword puzzles, and sudoku all fall under this category. Brain games are an easy and fun way to improve concentration and strengthen memory. The best part is that they only take a few minutes to play and offer a nice break during the day.
• Read a book with a book club – Reading a book offers many benefits, including stimulating different areas of your brain to process and analyze information. When you participate in a reading group , your brain will need to remember information for later recall. This information recall is highly beneficial to protecting short-term memory. Book clubs also can provide a fun and supportive social network.

2.    Spend time NOT looking for the solution

This is counterintuitive, but it’s an important strategy to use when working on a problem. Allow yourself some downtime after defining the problem.

Let your subconscious do some work. Setting a task aside for a time can actually improve your efforts later. When you return to the problem at hand, you’ll likely have a fresh perspective.

What should you do while giving your brain a break from active problem-solving? Enjoy a hobby, get some rest, or move your body with a walk or other form of exercise.

3.    Practice healthy habits

You guessed it, those healthy habits that affect so many areas of your life are also tied to a healthy brain. Exercise, a healthy diet, and quality sleep can all help your brain function better and improve your problem-solving skills overall.

• Exercise – Moving your body increases blood flow to the brain, which can improve your ability to think critically, clearly, and creatively. Additionally, physical activity is a known way to reduce stress and anxiousness. Research has shown creativity and problem-solving to be negatively affected by stress. Using exercise to combat stress can improve your ability to find solutions with a clear mind. By exercising regularly, your overall physical, emotional, and brain health may be positively impacted.
• Healthy Diet – Dr. Daniel Amen teaches that one of the secrets to a healthy brain is to focus on detoxification in your diet. This includes avoiding alcohol, drinking plenty of water, and consuming detoxifying vegetables . Some good vegetables to incorporate into your diet would be lettuce, spinach, kale, broccoli, and asparagus. You also may try increasing your protein intake for a healthy brain, or try adding in turmeric , which can increase neuroplasticity.
• Quality Sleep – Finally, don’t forget about the impact quality sleep, or the lack of it, can have on your brain function and problem-solving abilities. Getting a good night’s rest gives your brain time to recharge and that necessary downtime of not actively thinking about the problems needing solving. While you sleep, your subconscious has a chance to do some work for you!

When you engage in brain-boosting activities, take some downtime, and practice healthy habits you’ll be better prepared for the problems in your days. And, next time you’re faced with the inevitable problems that come with life and work, you can address them with more clarity and confidence.

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