Stimulus Reward Value Interacts with Training-induced Plasticity in Inhibitory Control

Area of Science:

• Neuroscience
• Cognitive Psychology
• Decision Science

Background:

• Inhibitory control training improves executive functions.
• Training also modifies responses to associated stimuli, suggesting interaction with reward and aversion systems.
• The precise brain mechanisms underlying these interactions are not fully understood.

Purpose of the Study:

• To investigate the spatio-temporal brain mechanisms of inhibitory control training.
• To examine how training affects the processing of rewarding versus aversive stimuli.
• To understand the neural basis of altered stimulus value following inhibition practice.

Main Methods:

• Electrical neuroimaging analyses of event-related potentials (ERPs).
• Go/NoGo tasks involving healthy participants inhibiting responses to food pictures (rewarding and aversive).
• Electrical source analyses to pinpoint brain activity.

Main Results:

• Behaviorally, training yielded greater improvement for aversive stimuli, indicating reward responses can hinder learning.
• Electrophysiological data showed distinct neural effects for rewarding versus aversive stimuli around 200 ms post-stimulus.
• Source analysis identified increased right orbito-cingulate and decreased temporo-parietal activity for rewarding stimuli, with the reverse for aversive stimuli.

Conclusions:

• Provides direct neurophysiological evidence for interactions between stimulus reward value and executive control training.
• Suggests that repeated motor inhibition alters stimulus assessment through associative learning and conflict reduction.
• Highlights the role of the orbito-cingulate and temporo-parietal regions in modulating responses to stimuli based on learned inhibition.