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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
6.1K
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

4.5K
The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
4.5K
Lobes of the Cerebrum01:22

Lobes of the Cerebrum

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The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements....
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Auditory Pathway01:15

Auditory Pathway

5.7K
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
5.7K
Somatosensation01:33

Somatosensation

38.3K
The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Related Experiment Video

Updated: Sep 3, 2025

Concurrent Recording of Co-localized Electroencephalography and Local Field Potential in Rodent
08:31

Concurrent Recording of Co-localized Electroencephalography and Local Field Potential in Rodent

Published on: November 30, 2017

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Evidence accumulation occurs locally in the parietal cortex.

Zhewei Zhang1,2, Chaoqun Yin1, Tianming Yang3

  • 1Institute of Neuroscience, Key Laboratory of Primate Neurobiology, Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, 200031, China.

Nature Communications
|July 30, 2022
PubMed
Summary

Researchers identified the origin of evidence accumulation in the brain. Neural activity in the parietal cortex locally computes evidence, a key process for decision-making.

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Last Updated: Sep 3, 2025

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Decision Science

Background:

  • Decision-making involves accumulating evidence, a neural process distributed across brain networks.
  • The precise neural origin of evidence accumulation remains unidentified.

Purpose of the Study:

  • To pinpoint the brain area responsible for initiating evidence accumulation.
  • To investigate whether evidence accumulation is computed locally within a brain region.

Main Methods:

  • A two-stage probabilistic reasoning task was designed.
  • Neural responses of posterior parietal cortex neurons were analyzed using a linear encoding model.
  • Neuronal activity was decomposed into early and late components representing distinct decision-making stages.

Main Results:

  • The posterior parietal cortex exhibits two dissociable neural stages of decision-making.
  • An early neural component reflects the transformation of sensory input into accumulable evidence.
  • A late neural component represents evidence accumulation and decision formation.

Conclusions:

  • Evidence accumulation signals are computed locally within the parietal cortex.
  • The parietal cortex plays a critical role in both processing sensory evidence and accumulating it for decisions.