Neural correlates of the Simon effect modulated by practice with spatial mapping.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Cognitive Control

Background:

• Cognitive control relies on established stimulus-response (S-R) mapping rules.
• The impact of newly acquired S-R rules on cognitive control remains poorly understood.

Purpose of the Study:

• To investigate how learning a new S-R mapping rule alters the brain's cognitive control system.
• To examine the neural mechanisms underlying the modification of cognitive control by learned S-R rules.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was employed.
• Participants engaged in tasks involving the Simon effect, with preceding practice manipulating S-R compatibility.

Main Results:

• Behaviorally, incompatible practice led to a reversed Simon effect, while compatible practice showed a classic Simon effect.
• fMRI revealed reduced anterior midcingulate cortex (aMCC) activity and increased functional coupling between aMCC and right frontopolar cortex (FPC) after incompatible practice.
• The temporoparietal junction showed increased response to stimuli matching prior practice configurations.
• Functional connectivity between the right FPC and ventral premotor cortex (vPMC) correlated with the Simon effect, suggesting a role in applying learned rules.

Conclusions:

• The brain dynamically modifies its cognitive control system based on newly learned S-R rules.
• Specific neural pathways, such as the FPC-vPMC circuit, may represent and implement abstract response rules acquired through practice.
• These findings elucidate the neural basis of adaptive cognitive control and rule learning.