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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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Measuring and Manipulating Functionally Specific Neural Pathways in the Human Motor System with Transcranial Magnetic Stimulation
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Network dynamics mediating ipsilateral motor cortex activity during unimanual actions.

Timothy Verstynen1, Richard B Ivry

  • 1Learning Research and Development Center, University of Pittsburgh, Pittsburgh, PA 15213, USA. timothyv@pitt.edu

Journal of Cognitive Neuroscience
|January 28, 2011
PubMed
Summary
This summary is machine-generated.

Motor cortex activity in both brain hemispheres increases during complex hand movements. The premotor cortex helps regulate this mirrored motor command activity, especially for intricate actions.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Physiology

Background:

  • Unimanual actions typically involve bilateral motor cortex activation.
  • The role of the ipsilateral motor cortex during unilateral movements remains incompletely understood.
  • Premotor areas are known to be involved in planning and executing movements.

Purpose of the Study:

  • To investigate the functional relationship between primary motor cortex (M1) and premotor areas during unimanual actions.
  • To explore the role of ipsilateral M1 activity during unilateral movements.
  • To determine the influence of movement complexity on motor cortex interactions.

Main Methods:

  • Transcranial Magnetic Stimulation (TMS) to assess motor-evoked potentials (MEPs) in resting muscles.
  • Functional Magnetic Resonance Imaging (fMRI) to visualize brain activity during movement.
  • Repetitive TMS (rTMS) to modulate activity in specific brain regions.

Main Results:

  • Ipsilateral M1 excitability, measured by MEPs in the stationary hand, correlated with the activity of the moving hand's homologous muscles.
  • This ipsilateral excitability increased with movement complexity.
  • fMRI revealed a correlation between ipsilateral and contralateral M1 activity that strengthened with movement complexity.
  • Low-frequency rTMS over the left caudal precentral premotor area (pcPM) enhanced the correlation between M1 activity in both hemispheres.

Conclusions:

  • The primary motor cortex exhibits significant ipsilateral activity during unimanual actions, particularly for complex movements.
  • The caudal precentral premotor area (pcPM) appears to play a regulatory role in modulating unintended motor command mirroring between the two M1s.
  • These findings shed light on the neural mechanisms underlying motor control and interhemispheric communication during skilled movements.