Reward improves response inhibition by enhancing attentional capture

Area of Science:

• Neuroscience
• Cognitive Psychology
• Decision Making

Background:

• Response inhibition is crucial for goal-directed behavior.
• The roles of attentional capture and motor inhibition in response inhibition are debated.
• Reward is known to influence cognitive control processes.

Purpose of the Study:

• To investigate whether reward directly impacts motor inhibition or indirectly influences it via attentional capture.
• To delineate the neural mechanisms underlying reward's effect on response inhibition.
• To differentiate the roles of the right inferior frontal gyrus (IFG) and pre-supplementary motor area (pre-SMA) in response inhibition.

Main Methods:

• Utilized a revised stop-signal task (SST) to separate attentional capture and motor inhibition.
• Employed functional magnetic resonance imaging (fMRI) to examine brain activity.
• Analyzed behavioral performance and functional connectivity.

Main Results:

• The right IFG was engaged during attentional capture (stop and continue trials).
• The pre-SMA was specifically activated during motor inhibition (stop vs. continue trials).
• Reward improved behavioral performance and increased IFG activity, linked to enhanced anterior cingulate cortex-IFG connectivity.

Conclusions:

• The right IFG is critical for attentional capture, while the pre-SMA is essential for motor inhibition.
• Reward indirectly enhances response inhibition by boosting attentional processing, specifically increasing IFG activation.
• These findings clarify the distinct roles of brain regions in cognitive control and the indirect mechanism of reward modulation.