Feb 3, 2016

Asymmetric reinforcement learning: computational and neural bases of positive life orientation

BioRxiv : the Preprint Server for Biology
Germain LefebvreStefano Palminteri

Abstract

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 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 worse-than-expected outcomes at a lower rate compared to better-than-expected ones. This asymmetry was correlated across subjects with standard measure of dispositional optimism. Multimodal imaging indicated that inter-individual variability in the expression of asymmetric update relies on the dorsomedial prefrontal cortex at both morphological and functional levels. Our results constitute a new step in the understanding of the genesis of optimism bias at the neurocomputational level.

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Mentioned in this Paper

Prefrontal Cortex
Serum Vitamin D Measurement
Research Subject
Morphological
Persons
Participant
Psychological Reinforcement
Learning
Reinforcement Surgical Repair
Carcinogenesis

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