Motor Control: Parietal Stimulation Prevents Voluntary Hand Movement

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Motor Control

Background:

• Action inhibition is traditionally linked to the frontal cortex.
• The precise neural mechanisms underlying voluntary movement control are still under investigation.

Purpose of the Study:

• To investigate the role of the posterior parietal cortex in the inhibition of voluntary movement.
• To determine if direct stimulation of the posterior parietal cortex affects movement initiation and execution.

Main Methods:

• Intra-surgical stimulation was applied to the posterior parietal cortex in human participants.
• The effects of stimulation on the initiation and execution of voluntary hand movements were observed.

Main Results:

• Stimulation of the posterior parietal cortex selectively inhibited the initiation and execution of voluntary movement.
• The observed effect was specific to the contralateral hand.

Conclusions:

• The posterior parietal cortex plays a crucial role in the inhibition of voluntary movement.
• These findings suggest a more distributed network for action inhibition than previously thought, involving both frontal and parietal areas.