Animal Cognition

, Volume 12, Issue 1, pp 169–180 | Cite as

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

  • Benjamin M. Basile
  • Robert R. Hampton
  • Stephen J. Suomi
  • Elisabeth A. Murray
Original Paper

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.

Keywords

Metamemory Metacognition Explicit memory Foraging Visual search 

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Copyright information

© National Institutes of Health - National Institute of Mental Health 2008

Authors and Affiliations

  • Benjamin M. Basile
    • 1
    • 2
  • Robert R. Hampton
    • 1
    • 2
  • Stephen J. Suomi
    • 3
  • Elisabeth A. Murray
    • 1
  1. 1.National Institute of Mental HealthBethesdaUSA
  2. 2.Department of PsychologyEmory UniversityAtlantaUSA
  3. 3.National Institute of Child Health and Human DevelopmentBethesdaUSA

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