Elsevier

Learning and Motivation

Volume 10, Issue 4, November 1979, Pages 419-444
Learning and Motivation

Acquisition and forgetting in monkeys' memory of informational object-reward associations

https://doi.org/10.1016/0023-9690(79)90056-0Get rights and content

Abstract

The first experiment showed the monkeys could recall whether an object had been rewarded with peanuts or with sultanas, two equally preferred foods. The second investigated the effect of rewarded trials with an object on monkeys' ability to recall a nonrewarded trial with the same object. The third demonstrated that monkeys could use the memory of reward to predict nonreward and the memory of nonreward to predict reward, in a Win-Shift Lose-Stay paradigm. The fourth found differences between Win-Shift Lose-Stay and Win-Stay Lose-Shift in the rate at which associations between objects and reward events were forgotten. These results are discussed in relation to D. L. Medin's (In A. M. Schrier, Ed., Behavioral primatology, Hillsdale, N.J.: Erlbaum, 1977, Vol. I, pp. 33–69) distinction between informational and hedonic effects of reward in monkeys. It is argued that the association between an object and a reward event is represented in memory by many independent traces, different traces recording the object's association with different attributes of the reward event.

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    This research was supported by the Medical Research Council. Martin Hollands, Clare Passingham, Mark Perkins, and Jenny Rolph helped train the monkeys.

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