An assessment of memory awareness in tufted capuchin monkeys (Cebus apella).

Animal Cognition
Benjamin M BasileElisabeth A Murray

Abstract

Humans, apes, and rhesus monkeys demonstrate memory awareness by collecting information when ignorant and acting immediately when informed. In this study, five capuchin monkeys searched for food after either watching the experimenter bait one of four opaque tubes (seen trials), or not watching (unseen trials). Monkeys with memory awareness should look into the tubes before making a selection only on unseen trials because on seen trials they already know the location of the food. In Experiment 1, one of the five capuchins looked significantly more often on unseen trials. In Experiment 2, we ensured that the monkeys attended to the baiting by interleaving training and test sessions. Three of the five monkeys looked more often on unseen trials. Because monkeys looked more often than not on both trial types, potentially creating a ceiling effect, we increased the effort required to look in Experiment 3, and predicted a larger difference in the probability of looking between seen and unseen trials. None of the five monkeys looked more often on unseen trials. These findings provide equivocal evidence for memory awareness in capuchin monkeys using tests that have yielded clear evidence in humans, apes, and rhesus monkeys.

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Citations

Feb 27, 2009·Animal Cognition·Kazuo Fujita
Sep 13, 2011·Animal Cognition·Allison L Foote, Jonathon D Crystal
Jul 18, 2012·Animal Cognition·Michael J Beran, Audrey E Parrish
Aug 28, 2012·Animal Cognition·Chikako Suda-KingFrancys Subiaul
Apr 12, 2012·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·J David SmithMichael J Beran
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Dec 11, 2013·Animal Cognition·Arii WatanabeNicola S Clayton
Aug 13, 2015·Animal Cognition·Arii Watanabe, Nicola S Clayton
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Aug 4, 2015·Animal Cognition·Raphaëlle MalassisJoël Fagot
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Oct 16, 2012·Animal Cognition·Sumie IwasakiKazuo Fujita
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Mar 25, 2020·Animal Cognition·Megan L Lambert, Mathias Osvath
Jan 10, 2020·Neuropsychologia·Robert R HamptonRyan J Brady

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