Neural Substrates of Approach-Avoidance Control in Motivational Conflict.

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Decision Neuroscience

Background:

• Adaptive behavior necessitates effective control over automatic approach and avoidance tendencies.
• Dysregulation of approach-avoidance control is implicated in psychiatric disorders like anxiety and addiction.
• The neural mechanisms underlying this control are not fully understood.

Purpose of the Study:

• To investigate the neural circuits involved in approach-avoidance control using functional magnetic resonance imaging (fMRI) and eye-tracking.
• To examine how the brain resolves conflicts between avoiding threat and approaching reward.
• To identify neural signatures differentiating salience and valence processing during conflict.

Main Methods:

• fMRI with eye-tracking and behavioral measures in 40 participants.
• An approach-avoidance conflict task with conditioned stimuli predicting aversive, appetitive, or both outcomes.
• Analysis of neural activity during anticipation, response, and outcome phases, including multivariate pattern and psychophysiological interaction analyses.

Main Results:

• Overcoming threat-driven avoidance activated the left inferior frontal gyrus (IFG); suppressing reward-driven approach did not show distinct neural signatures.
• Anticipation of conflicting stimuli involved overlapping salience-control networks (MCC/ACC, insula, IFG, VS).
• A dissociation was observed where conflicting stimuli evoked threat-like anticipatory responses but led to reward-like approach behavior, driven by ventral striatum (VS) encoding and VS-right temporoparietal junction (rTPJ) coupling.

Conclusions:

• Motivational control prioritizes salience over valence.
• A VS-rTPJ network is crucial for resolving approach-avoidance conflicts.
• Findings offer insights into neural dynamics of flexible goal-directed behavior and potential mechanisms in psychiatric disorders.