RT Journal Article
SR Electronic
T1 Optimistic reinforcement learning: computational and neural bases
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 038778
DO 10.1101/038778
A1 G. Lefebvre
A1 M. Lebreton
A1 F. Meyniel
A1 S. Bourgeois-Gironde
A1 S. Palminteri
YR 2016
UL http://biorxiv.org/content/early/2016/10/03/038778.abstract
AB While forming and updating beliefs about future life outcomes, people tend to consider good news and to disregard bad news. This tendency is supposed to support the optimism bias. Whether this learning bias is specific to “high-level” abstract belief update or a particular expression of a more general “low-level” reinforcement learning process is unknown. Here we report evidence in favor of the second hypothesis. In a simple instrumental learning task, participants incorporated better-than-expected outcomes at a higher rate compared to worse-than-expected ones. In addition, functional imaging indicated that inter-individual difference in the expression of optimistic update corresponds to enhanced prediction error signaling in the reward circuitry. Our results constitute a new step in the understanding of the genesis of optimism bias at the neurocomputational level.