Journal
LEARNING AND MOTIVATION
Volume 36, Issue 2, Pages 245-259Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.lmot.2005.02.004
Keywords
macaque; primate; episodic memory; spatial; hippocampus; episodic-like; nonhuman; mental time travel; semantic memory
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We adapted a paradigm developed by Clayton and Dickinson (1998), who demonstrated memory for what, where, and when in scrub jays, for use with rhesus monkeys. In the study phase of each trial, monkeys found a preferred and a less-preferred food reward in a trial-unique array of three locations in a large room. After 1 h, monkeys returned to the test room, where they found foods placed as during study. Twenty-five hours after the study phase monkeys again searched the room, but now the preferred food was replaced with a distasteful food remnant, while the less-preferred food was still present. Although monkeys remembered the locations of the foods for up to 25 h, they did not learn that the preferred food was available after the short, but not after the long delay. Thus, monkeys demonstrated long-term memory for the type and location of food but failed to demonstrate sensitivity to when they acquired that knowledge. Published by Elsevier Inc.
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