Willing to wait: Elevated reward-processing EEG activity associated with a greater preference for larger-but-delayed...

Area of Science:

• Neuroscience
• Cognitive Science
• Decision Science

Background:

• Individual differences in delay-discounting, the devaluation of future rewards, are significant.
• Reward processing, particularly neural activity heterogeneity, is a key factor influencing these differences.

Purpose of the Study:

• To investigate individual differences in delay-discounting by examining neural activity during reward processing.
• To identify specific stages and characteristics of neural activity associated with reward processing and delay-discounting.

Main Methods:

• Electroencephalography (EEG) was used to measure neural activity during a reward-learning task.
• Participants completed a behavioral delay-discounting task and a reward time-estimation task with EEG.
• Time-frequency analysis separated reward-anticipation and reward-outcome neural activity.

Main Results:

• Reward trials, compared to no-reward trials, showed enhanced EEG activity in both reward-anticipation and reward-outcome stages.
• EEG indices correlated with performance in the time-estimation task, indicating their role in reward-based learning.
• Stronger EEG markers (pre-feedback alpha suppression, feedback-locked theta and beta power) during reward anticipation and outcome were linked to a greater preference for delayed rewards.

Conclusions:

• Enhanced neural processing during reward anticipation and outcome is associated with a stronger preference for larger, delayed rewards.
• Specific EEG indices at distinct reward-processing stages can illuminate the neural basis of individual differences in delay-discounting.