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Ventrolateral Prefrontal Cortex Contributes to Human Motor Learning.

Neeraj Kumar1,2, Ananda Sidarta1,3, Chelsea Smith1

  • 1Department of Psychology, McGill University, Montreal, Quebec H3A1G1, Canada.

Eneuro
|September 16, 2022
PubMed
Summary
This summary is machine-generated.

The ventrolateral prefrontal cortex (BA 9/46v) is crucial for human motor learning. Disrupting this area in the left hemisphere significantly impaired learning, highlighting its role in motor skill acquisition.

Keywords:
TMSmotor learningreinforcement

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Motor Control

Background:

  • The ventrolateral prefrontal cortex (BA 9/46v) shows connections to sensorimotor regions and basal ganglia in primates.
  • Electrophysiological studies suggest BA 9/46v involvement in sensory memory and reward processing.

Purpose of the Study:

  • To directly test the hypothesis that BA 9/46v is involved in reinforcement-based motor learning in humans.
  • To investigate the causal role of left vs. right hemisphere BA 9/46v in motor learning.

Main Methods:

  • Participants performed a reaching movement task with positive feedback.
  • Continuous theta burst stimulation (cTBS) was used to temporarily disrupt BA 9/46v in either the left or right hemisphere.
  • A control group received sham cTBS.

Main Results:

  • Disruption of left BA 9/46v using cTBS almost completely eliminated motor learning.
  • Disruption of right BA 9/46v did not significantly affect motor learning compared to sham stimulation.
  • Movement variability increased after left BA 9/46v disruption, suggesting a deficit in spatial or movement memory, not reward processing.

Conclusions:

  • The ventrolateral prefrontal cortex (BA 9/46v), particularly in the left hemisphere, is essential for human motor learning.
  • This finding establishes BA 9/46v as a key component of the human motor learning circuit.
  • The results differentiate the roles of hemispheres in motor learning and memory.