Neural Dynamics Underlying Uncertain Reward Evaluation in Individuals With Intolerance of Uncertainty

Area of Science:

• Neuroscience
• Psychology
• Cognitive Science

Background:

• Intolerance of uncertainty (IU) is a transdiagnostic factor in internalizing disorders.
• Research has focused on IU's impact on threat processing, with less attention to reward processing.
• Understanding IU's role in reward processing is crucial for internalizing disorder research.

Purpose of the Study:

• To investigate the neural dynamics of uncertain reward processing in individuals with high versus low IU.
• To examine how different types of uncertainty (probability, time, magnitude) affect reward evaluation.
• To identify IU-related differences in neural responses during reward feedback.

Main Methods:

• Event-related potential (ERP) study using electroencephalography (EEG).
• Comparison between a high-IU group (N=35) and a low-IU group (N=36).
• Participants completed guessing tasks with predictable vs. unpredictable reward delivery (probability, time, magnitude).

Main Results:

• High-IU group showed a behavioral aversion to uncertainty.
• Low-IU group, not high-IU, showed sensitivity to predictable vs. unpredictable rewards in early reward processing (reward positivity), specifically for time uncertainty.
• High-IU group, compared to low-IU, showed greater sensitivity to predictability vs. unpredictability in late reward processing (P3), irrespective of uncertainty type.

Conclusions:

• Individual differences in IU are associated with distinct neural processing of uncertain rewards.
• Findings suggest a valence-independent maladaptation in uncertainty processing in high IU.
• This research highlights the importance of considering IU in understanding reward-based decision-making and internalizing disorders.