Journal article

Separate encoding of model-based and model-free valuations in the human brain

Ulrik R Beierholm, Cedric Anen, Steven Quartz, Peter Bossaerts

NeuroImage | ACADEMIC PRESS INC ELSEVIER SCIENCE | Published : 2011

Abstract

Behavioral studies have long shown that humans solve problems in two ways, one intuitive and fast (System 1, model-free), and the other reflective and slow (System 2, model-based). The neurobiological basis of dual process problem solving remains unknown due to challenges of separating activation in concurrent systems. We present a novel neuroeconomic task that predicts distinct subjective valuation and updating signals corresponding to these two systems. We found two concurrent value signals in human prefrontal cortex: a System 1 model-free reinforcement signal and a System 2 model-based Bayesian signal. We also found a System 1 updating signal in striatal areas and a System 2 updating sign..

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University of Melbourne Researchers