Adjustments to Proactive Motor Inhibition without Effector-Specific Foreknowledge Are Reflected in a Bilateral...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Motor Control

Background:

• Inhibitory control allows humans to cancel initiated movements.
• Proactive inhibitory control anticipates potential stop-signals, enhancing movement cancellation.
• Neurophysiological underpinnings of proactive inhibition remain unclear.

Purpose of the Study:

• To investigate the neurophysiological effects of proactive inhibitory control on the motor system.
• To test the hypothesis that proactive inhibition influences sensorimotor beta-burst rates.
• To examine the relationship between beta-burst activity and behavioral measures of proactive inhibition.

Main Methods:

• Scalp electroencephalography (EEG) recordings in 41 healthy adults.
• Bimanual reaction time (RT) task with and without stop-signals.
• Analysis of sensorimotor beta-band activity (13-30 Hz) during movement initiation.

Main Results:

• Premovement beta-burst rates were higher in stop-signal blocks compared to pure-go blocks.
• Increased beta-burst rates correlated with enhanced proactive inhibition (behavioral slowing).
• Elevated beta-bursting was observed during the baseline period before movement initiation signals.

Conclusions:

• Proactive inhibitory control is implemented by upregulating tonic inhibition of the motor system.
• Increased sensorimotor beta-bursting signifies the strategic deployment of proactive motor control.
• These findings elucidate the neural mechanisms underlying anticipatory movement regulation.