Reward associations do not explain transitive inference performance in monkeys

Science Advances
Greg JensenHerbert S Terrace

Abstract

Most accounts of behavior in nonhuman animals assume that they make choices to maximize expected reward value. However, model-free reinforcement learning based on reward associations cannot account for choice behavior in transitive inference paradigms. We manipulated the amount of reward associated with each item of an ordered list, so that maximizing expected reward value was always in conflict with decision rules based on the implicit list order. Under such a schedule, model-free reinforcement algorithms cannot achieve high levels of accuracy, even after extensive training. Monkeys nevertheless learned to make correct rule-based choices. These results show that monkeys' performance in transitive inference paradigms is not driven solely by expected reward and that appropriate inferences are made despite discordant reward incentives. We show that their choices can be explained by an abstract, model-based representation of list order, and we provide a method for inferring the contents of such representations from observed data.

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Citations

Jul 7, 2020·Wiley Interdisciplinary Reviews. Cognitive Science·Nicolas Porot, Eric Mandelbaum
Jun 12, 2020·Scientific Reports·Fabian MunozVincent P Ferrera
Jul 25, 2021·Animal Cognition·Greg JensenHerbert S Terrace

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