What Does the Brain's Cerebral Cortex Do?By Olivia Guy-Evans, published May 19, 2021 Show
by Saul Mcleod, PhD What is the Cerebral Cortex?The cerebral cortex is the outermost layer of the brain that is associated with our highest mental capabilities. The cerebral cortex is primarily constructed of grey matter (neural tissue that is made up of neurons), with between 14 and 16 billion neurons being found here. Although the cerebral cortex is only a few millimeters in thickness, it consists of approximately half the weight of the total brain mass. The cerebral cortex has a wrinkled appearance, consisting of bulges, also known as gyri, and deep furrows, known as sulci. The many folds and wrinkles of the cerebral cortex allow for a wider surface area for an increased number of neurons to live there, permitting large amounts of information to be processed. The cortex is also divided into two hemispheres, the right and left, which is separated by a large sulcus called the medial longitudinal fissure. The two hemispheres are connected via bundles of nerve fibers called the corpus callosum, to allow both hemispheres of the cerebral cortex to communicate with each other and for further connections to be made. A vast array of functions are controlled by the cerebral cortex through the use of the lobes, which are divided based on the location of gyri and sulci. These lobes are called the frontal lobes, temporal lobes, parietal lobes, and occipital lobes.
Together the lobes serve many conscious and unconscious functions such as being responsible for movement, processing sensory information from the senses, processing language, intelligence, and personality. Frontal Lobes The largest lobes of the cerebral cortex are the frontal lobes. These are located at the front of the brain behind the forehead. The frontal lobe’s functions primarily involve ‘higher’ cognitive functions such as decision-making, conscious thought, problem-solving, and attention. The frontal lobes are believed to be where our emotions and behaviors are controlled, so are activated when in social situations so that we may act socially appropriately. The frontal lobes contain Broca’s Area which is an area essential for language production. Moreover, the frontal lobes are thought to be the home of where our personalities are kept, as well as where our intelligence is housed. Occipital LobesThe occipital lobes, located at the rear of the brain receive sensory information from the retinas of the eyes. This information is then encoded into different visual data such as color, motion, and orientation. This region is also responsible for object and face recognition, assessing depth and distance, as well as being able to map the visual world. It was once believed that the occipital lobes’ only function was in controlling visual fields. It is now known this region serves other functions and is able to communicate with other brain regions. Parietal LobesThe parietal lobes of the cerebral cortex are situated between the frontal and occipital lobes, above the temporal lobes. This region is especially important for integrating the body’s sensory information, so we can build a picture of the world around us. The parietal lobes allow us to perceive our bodies and integrate somatosensory information such as touch, pressure, and temperature. This area can also allow us to coordinate our movements in response to the environment through spatial mapping and attentional functions. Temporal LobesThe temporal lobes, which are the second largest lobe of the cerebral cortex, are associated with memory, hearing, emotion, and some aspects of language. The left temporal lobe, which is usually the most dominant in people, is associated with comprehending language, memorizing verbal information, forming speech, and learning. The right lobe, however, is associated with memorizing non-verbal information, recognizing information, and determining facial expressions. The temporal lobes depend on both sensory input from the environment, as well as input from other brain regions. These lobes can convert sounds heard into visual images in the brain, therefore being vital in processing auditory information. We would not be able to understand someone talking to us without temporal lobe functioning to help us make sense of language. Areas of the Cerebral CortexThe cerebral cortex can be characterised as being made up of three types of divisions, which serve different purposes: sensory, motor, and association areas. The combination of these three areas account for most of human’s cognition and behavior. Sensory AreasThe sensory areas of the cerebral cortex receive sensory information from the senses and environmental stimuli. This information is also processed by the sensory areas to give meaning to this information. The sensory areas include the visual cortex, the somatosensory cortex, the auditory cortex, and the gustatory cortex. The visual cortex is an area within the occipital lobes which is essential to the conscious processing of visual stimuli. There are two visual cortices in the brain: the cortex in the left hemisphere receives signals from the right visual field, whereas the cortex in the right hemisphere receives signals from the left visual field. The visual cortex is important for making sense of visual information and plays a role in object recognition and representation. The somatosensory cortex is located with the parietal lobe and receives tactile information from the body. This information can include temperature, touch, and pain, all of which is then integrated in the somatosensory cortex to produce a ‘map’ of the body. The auditory cortex is an area within the temporal lobes which is responsible for processing auditory information. This cortex can perform basic and higher functions relating to hearing, including the ability for some people to language switch. Finally, the gustatory cortex is a region in the frontal lobe which is responsible for the perception of taste and flavor. Motor AreasThe motor areas of the cerebral cortex are involved in the regulation and initiation of voluntary movement. These areas are primarily found within the frontal lobes and include the primary motor cortex, premotor cortex, and the supplementary cortex. The primary motor cortex is associated with the coordination and initiation of motor movements. Each cerebral hemisphere of the primary motor cortex contains a motor-related representation of the opposite side of the body. There is also a representational map of the body with the primary motor cortex, called a motor homunculus. The premotor cortex is involved in preparing and executing limb movements, as well as using information from other regions of the cortex to select appropriate movements. The premotor cortex is also necessary for learning, especially through imitation, and social cognition, specifically empathy. The supplementary cortex is responsible for the planning of complex movements and contributes to the control of movement. Association AreasThe association areas are spread throughout the cerebral cortex in the four lobes. These areas act by integrating information from these brain regions, often adding more complexity to their functions. These association areas can also form connections to sensory and motor areas to give meaning to and organise information in these areas. Association areas within the frontal lobes are involved in key processes such as planning, thinking, and feeling. These areas also play a role in personality and controlling emotional behaviors. Association areas within the parietal lobe are involved in spatial skills such as spatial awareness and reasoning, as well as being responsible for paying attention to visual stimuli in the environment. In the temporal lobes, association areas function primarily in memory processes such as helping to process procedural and episodic memories. These areas also communicate with other lobes of the cortex so they can complete memory-related processes. Occipital lobe association areas help to facilitate memories associated with visuals to be retained as well as enabling us to think in a visual manner. These areas in the occipital lobes also communicate with other lobes of the cortex to assimilate visual information with memories, sounds, and language to understand visual stimuli. Cerebral Cortex Damage
About the AuthorOlivia Guy-Evans obtained her undergraduate degree in Educational Psychology at Edge Hill University in 2015. She then received her master’s degree in Psychology of Education from the University of Bristol in 2019. Olivia has been working as a support worker for adults with learning disabilities in Bristol for the last four years. How to reference this article:How to reference this article:Guy-Evans, O. (2021, May 19). What does the brain's cerebral cortex do? Simply Psychology. www.simplypsychology.org/what-is-the-cerebral-cortex.html APA Style ReferencesBailey, R. (2020, February 05). What Does the Brain’s Cerebral Cortex Do? Thought Co. What Does the Brain's Cerebral Cortex Do? (thoughtco.com) FlintRehab. (2021, January 11). Cerebral Cortex Damage: Definition, Symptoms, and Recovery. https://www.flintrehab.com/cerebral-cortex-damage/#:~:text=Parietal%20Lobe%20Damage,problems%20with%20sensation%20and%20perception. Guy-Evans, O. (2021, April 13). Temporal lobe: definition, functions, and location. Simply Psychology. www.simplypsychology.org/temporal-lobe.html Guy-Evans, O. (2021, April 15). Parietal lobe: definition, functions, and location. Simply Psychology. www.simplypsychology.org/parietal-lobe.html Guy-Evans, O. (2021, April 19). Occipital lobe: definition, functions, and location. Simply Psychology. www.simplypsychology.org/occipital-lobe.html Guy-Evans, O. (2021, May 08). Frontal lobe function, location in brain, damage, more. Simply Psychology. www.simplypsychology.org/frontal-lobe.html Huang, J. (2020, September). Brain Dysfunction by Location. MSD Manual. https://www.msdmanuals.com/en-gb/home/brain,-spinal-cord,-and-nerve-disorders/brain-dysfunction/brain-dysfunction-by-location Lowndes, G., & Savage, G. (2007). Early detection of memory impairment in Alzheimer’s disease: a neurocognitive perspective on assessment. Neuropsychology Review, 17(3), 193-202. Mubarik, A., & Tohid, H. (2016). Frontal lobe alterations in schizophrenia: a review. Trends in Psychiatry and Psychotherapy, 38(4), 198-206. Onitsuka, T., McCarley, R. W., Kuroki, N., Dickey, C. C., Kubicki, M., Demeo, S. S., Frumin, M., Kikinis, R., Jolesz, F. A. & Shenton, M. E. (2007). Occipital lobe gray matter volume in male patients with chronic schizophrenia: A quantitative MRI study. Schizophrenia Research, 92(1-3), 197-206. Valdois, S., Lassus-Sangosse, D., Lallier, M., Moreaud, O., & Pisella, L. (2019). What bilateral damage of the superior parietal lobes tells us about visual attention disorders in developmental dyslexia. Neuropsychologia, 130, 78-91. Zhou, S. Y., Suzuki, M., Takahashi, T., Hagino, H., Kawasaki, Y., Matsui, M., Seto, H. & Kurachi, M. (2007). Parietal lobe volume deficits in schizophrenia spectrum disorders. Schizophrenia Research, 89(1-3), 35-48. Home | About Us | Privacy Policy | Advertise | Contact Us Simply Psychology's content is for informational and educational purposes only. Our website is not intended to be a substitute for professional medical advice, diagnosis, or treatment. © Simply Scholar Ltd - All rights reserved
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