Behavioral approach and reward processing: Results on feedback-related negativity and P3 component

This study examined the FRN, the P3, and individual differences in trait-BAS and trait-BIS in the context of reward expectation mismatch. A more negative FRN was predicted for higher vs. lower trait-BAS individuals and for higher vs. lower trait-BIS individuals. In the extinction-learning task, participants (N = 102) chose between two response buttons to earn a maximum of points. In the acquisition phase, button 1 was continuously rewarded and button 2 was partially rewarded. In the extinction phase, one button was unexpectedly no longer rewarded. The FRN amplitude was more negative for higher vs. lower trait-BAS individuals and for lower vs. higher trait-BIS individuals within the extinction phase. The P3 was more positive in the extinction compared to the acquisition phase. Our results suggest that higher trait-BAS individuals have a more pronounced reward expectation mismatch.

► We investigate reward expectation mismatch by means of FRN and trait-BAS.
► In an extinction-learning task the number of responses decreased under non-reward.
► A response adaptation delay was indicated by longer response under non-reward.
► The FRN became more negative in higher trait-BAS individuals under non-reward.
► Reward expectation mismatch was more pronounced in higher trait-BAS individuals.