Modelling individual differences in the form of Pavlovian conditioned approach responses: a dual learning systems approach with factored representations.

ABSTRACT: Reinforcement Learning has greatly influenced models of conditioning, providing powerful explanations of acquired behaviour and underlying physiological observations. However, in recent autoshaping experiments in rats, variation in the form of Pavlovian conditioned responses (CRs) and associated dopamine activity, have questioned the classical hypothesis that phasic dopamine activity corresponds to a reward prediction error-like signal arising from a classical Model-Free system, necessary for Pavlovian conditioning. Over the course of Pavlovian conditioning using food as the unconditioned stimulus (US), some rats (sign-trackers) come to approach and engage the conditioned stimulus (CS) itself - a lever - more and more avidly, whereas other rats (goal-trackers) learn to approach the locatio

SUBMITTER: Lesaint F 

PROVIDER: S-EPMC3923662 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature