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Related Concept Videos

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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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.
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Association Areas of the Cortex01:21

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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 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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Lobes of the Cerebrum01:22

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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.
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The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
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Related Experiment Video

Updated: Sep 10, 2025

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Object-directed action representations are componentially built in parietal cortex.

Leyla Roksan Caglar1,2, Jon Walbrin2, Emefa Akwayena1,3

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh, PA 15213.

Proceedings of the National Academy of Sciences of the United States of America
|August 20, 2025
PubMed
Summary
This summary is machine-generated.

The supramarginal gyrus (SMG) uses kinematic synergies to represent complex object-directed actions. Unlike visual models, SMG activity is driven by movement properties, not visual similarity, supporting its role in action planning.

Keywords:
functional MRIobject graspingpredictive encodingsupramarginal gyrustool use

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Motor Control

Background:

  • The inferior parietal lobule is crucial for object manipulation.
  • The supramarginal gyrus (SMG) within this region processes object-directed actions.
  • Understanding how the brain represents complex actions is key to motor control.

Purpose of the Study:

  • To investigate how the supramarginal gyrus (SMG) represents complex object-directed actions.
  • To determine if kinematic synergies form the basic units of these representations.
  • To differentiate between visual and motor-based representations in the SMG.

Main Methods:

  • Developed a linear encoding model using empirically defined kinematic synergies.
  • Componentially built complex actions from these synergies.
  • Compared model predictions in the SMG with those in visual areas using image-computable similarity models (AlexNet, ResNet50, VGG16).

Main Results:

  • Neural representations of complex object-directed actions in the SMG were predicted by the kinematic synergy model.
  • Visual similarity models (AlexNet, ResNet50, VGG16) predicted visual areas but not the SMG.
  • SMG activity was modulated by kinematic, not visual, properties of actions.

Conclusions:

  • The supramarginal gyrus (SMG) uses kinematic synergies as fundamental units to build representations of complex object-directed actions.
  • These representations are action-relevant, not visually relevant, aligning with apraxia studies.
  • Kinematic synergies may be analogous to features in speech production, forming building blocks for complex actions.