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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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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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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Related Experiment Video

Updated: Aug 27, 2025

Intracortical Inhibition Within the Primary Motor Cortex Can Be Modulated by Changing the Focus of Attention
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Motor cortical influence relies on task-specific activity covariation.

Claire L Warriner1, Samaher Fageiry1, Shreya Saxena2

  • 1Department of Neuroscience, Columbia University, New York, NY 10027, USA; Zuckerman Mind Brain Behavior Institute, Columbia University, New York, NY 10027, USA.

Cell Reports
|September 28, 2022
PubMed
Summary

Motor cortex controls muscle movements by altering how neurons coordinate their activity, not by using separate neuron groups for different tasks. This neural coordination shift enables both alternating and stabilizing muscle actions.

Keywords:
CP: NeuroscienceEMGalternationantagonist musclescaudal forelimb areacocontractionmotor cortexmouseneural activityneural activity subspace

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Area of Science:

  • Neuroscience
  • Motor Control
  • Computational Neuroscience

Background:

  • Spinal circuits enable alternating muscle activation for limb movement.
  • Antagonist cocontraction stabilizes joints during tasks like load handling.
  • Existing theories propose separate motor cortical outputs or task-specific populations for these distinct muscle activation patterns.

Purpose of the Study:

  • To investigate the neural mechanisms underlying different muscle activation patterns (alternation vs. cocontraction) originating from the motor cortex.
  • To differentiate between hypotheses of separate motor cortical output populations versus task-specific population recruitment.

Main Methods:

  • Developed a behavioral paradigm for mice to switch between forelimb tasks requiring antagonist muscle alternation or cocontraction.
  • Measured neural activity in motor cortical layer 5b, focusing on corticospinal neurons.

Main Results:

  • Observed no consistent flexion- or extension-related activity across tasks.
  • Found no evidence for distinct task-specific motor cortical neuron populations.
  • Demonstrated significant changes in neural activity covariation among motor cortical neurons between tasks.
  • Confirmed that altered activity covariation specifically impacts corticospinal neuron output.

Conclusions:

  • Motor cortex does not rely on separate output populations for alternating vs. cocontraction tasks.
  • The motor cortex employs task-specific changes in neural activity covariation to control different muscle activation patterns.
  • This dynamic neural coordination strategy allows for flexible control of limb movement and joint stabilization.