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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:23

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 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:
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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
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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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Parallel Processing01:20

Parallel Processing

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Lateralization

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Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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Related Experiment Video

Updated: Feb 26, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Partially Mixed Selectivity in Human Posterior Parietal Association Cortex.

Carey Y Zhang1, Tyson Aflalo1, Boris Revechkis1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Neuron
|July 25, 2017
PubMed
Summary

Motor cortex neurons in the anterior intraparietal cortex encode multiple movement variables, not strictly segregated by body part. This "partially mixed coding" has implications for brain-computer interfaces.

Keywords:
Mixed selectivityanterior intraparietal cortexbrain-machine interfacesfunctional segregationmotor imageryposterior parietal cortexspinal cord injury

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • The posterior parietal cortex is crucial for sensorimotor integration and action planning.
  • Understanding how motor representations are organized is key to deciphering neural coding.

Purpose of the Study:

  • To investigate the coding of body side, body part, and cognitive strategy in the human anterior intraparietal cortex.
  • To determine if motor representations are strictly segregated anatomically or if they exhibit mixed selectivity.

Main Methods:

  • Electrophysiological recordings from single units in the anterior intraparietal cortex.
  • Analysis of neural responses during various motor tasks involving different body parts, sides, and cognitive strategies.

Main Results:

  • All tested motor variables (body side, body part, cognitive strategy) were encoded by neurons.
  • Neurons showed mixed selectivity, coding for conjunctions of variables, particularly for body parts.
  • Functional segregation of effector responses occurred despite anatomical overlap, due to orthogonal coding of body parts.
  • Body side and strategy coding were organized by effector, not mixed.

Conclusions:

  • The anterior intraparietal cortex exhibits 'partially mixed coding,' where different variables are encoded with varying degrees of mixed selectivity.
  • This coding scheme allows for flexible and efficient representation of complex movements.
  • The findings suggest potential benefits for neuroprosthetics, enabling decoding of extensive body movements from a single neural array.