Early response competition over the motor cortex underlies proactive control of error correction

Area of Science:

• Neuroscience
• Cognitive Psychology
• Human Motor Control

Background:

• Response inhibition is crucial for flexible goal-directed behavior, balancing automatic and controlled actions.
• The precise mechanism of proactive inhibition, whether top-down control or response competition, remains debated.

Purpose of the Study:

• To investigate the neural and behavioral correlates of proactive inhibitory control.
• To differentiate between top-down inhibitory control and response competition models in error amendment.

Main Methods:

• Utilized a modified Eriksen flanker task with manipulated error correction demands.
• Examined behavioral data and electrophysiological signals (EEG).

Main Results:

• Reactive inhibition correlates were unaffected by error correction manipulation.
• Proactive inhibitory control required early, sustained, bilateral activation of both correct and incorrect motor responses.
• Defective response suppression was linked to selective unilateral response preparation.

Conclusions:

• Findings support a dual motor command pre-activation model for proactive inhibition, driven by response competition.
• Early response competition appears critical for successful action selection and error amendment.