Reward Boosts Neural Coding of Task Rules to Optimize Cognitive Flexibility.

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• Cognitive flexibility is essential for intelligent behavior but is often effortful and suboptimal.
• Reward prospect is known to improve flexible behavior, suggesting it optimizes control processes.

Purpose of the Study:

• To investigate how varying reward prospects influence neural encoding of task rule information.
• To understand the mechanisms by which reward prospect optimizes cognitive flexibility.

Main Methods:

• Representational similarity analysis (RSA) applied to human electroencephalograms (EEG).
• Participants performed a rule-guided decision-making task with trial-by-trial reward variations.
• EEG data recorded from male and female participants.

Main Results:

• Participants exhibited faster and more accurate judgments on high-reward trials.
• High reward prospect significantly boosted the neural coding of the active task rule.
• The enhancement in task rule coding correlated with improved task performance, particularly on switch trials.

Conclusions:

• Reward prospect enhances cognitive performance by strengthening neural coding of task rule information.
• This mechanism contributes to improved cognitive flexibility in complex behaviors.
• Motivation, driven by reward, modulates neural processing for flexible decision-making.