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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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Motor and Sensory Areas of the Cortex01:14

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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
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....
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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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Somatosensation01:33

Somatosensation

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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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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,...
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Lateralization01:28

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: Oct 9, 2025

Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
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An action-concept processing advantage in a patient with a double motor cortex.

Magdalena Miranda1, Cecilia Gonzalez Campo2, Agustina Birba3

  • 1National Scientific and Technical Research Council (CONICET), Buenos Aires, Argentina; Instituto de Neurociencia Cognitiva y Traslacional (INCyT), Buenos Aires, Argentina.

Brain and Cognition
|December 18, 2021
PubMed
Summary

A patient with a double motor cortex showed faster action concept processing than object concept processing. This suggests enhanced motor cortex function may improve action semantics.

Keywords:
Action semanticsEmbodied cognitionFunctional connectivityMotor cortexSubcortical band heterotopia

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Neurology

Background:

  • Patients with motor cortex atrophy have deficits in processing action meanings.
  • This suggests a link between motor region tissue and movement conceptualization.

Purpose of the Study:

  • To investigate the relationship between motor cortex structure and action-semantic processing.
  • To examine a unique case of a patient with a double cortex in motor regions but not semantic regions.

Main Methods:

  • Behavioral testing of action and object concept processing in a patient with a double motor cortex and healthy controls.
  • Resting-state functional connectivity analysis was performed.

Main Results:

  • The patient demonstrated preserved accuracy in both action and object categories.
  • The patient showed faster processing of action concepts compared to object concepts, independent of general cognitive abilities.
  • Heightened functional connectivity was observed between the patient's bilateral primary motor cortices.

Conclusions:

  • A functionally active double motor cortex may confer advantages in action-processing.
  • Findings provide new insights into models of action semantics and motor cortex function.