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Working memory in capuchin monkeys (Cebus apella).

Maria Clotilde H Tavares1, Carlos Tomaz

  • 1Primate Center and Department of Physiological Sciences, Institute of Biology, University of Brasijlia, CEP 70910-900, DF, Brasilia, Brazil. clo@unb.br

Behavioural Brain Research
|February 15, 2002
PubMed
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Capuchin monkeys demonstrate strong working memory and concept learning abilities. They successfully performed delayed (non-)matching to sample tasks with novel stimuli across various delays, indicating potential as a model for memory research.

Area of Science:

  • Cognitive Neuroscience
  • Primate Behavior
  • Comparative Psychology

Background:

  • Delayed (non-)matching to sample (DNMTS/DMTS) tasks with trial-unique stimuli are crucial for understanding animal cognition.
  • Investigating working memory in non-human primates offers insights into the evolution of cognitive functions.

Purpose of the Study:

  • To evaluate the capacity of New World capuchin monkeys (Cebus apella) in performing trial-unique delayed matching to sample (DMTS) and delayed non-matching to sample (DNMTS) tasks.
  • To assess capuchin monkey working memory performance across varying delay intervals (8 seconds to 10 minutes).

Main Methods:

  • Subjects performed trial-unique DMTS and DNMTS tasks using a modified Wisconsin General Test Apparatus.
  • Training involved an initial 8-second delay until a learning criterion was met.

Related Experiment Videos

  • Memory performance was subsequently tested at delay intervals of 15 s, 60 s, 120 s, and 10 min.

    • Main Results:

    • All capuchin monkeys successfully learned both DMTS and DNMTS tasks, with no significant difference in trials to criterion between tasks.
    • Performance across all delay intervals remained above chance levels for both tasks.
    • Memory performance did not significantly decrease as delay intervals increased, suggesting robust working memory capacity.

    Conclusions:

    • Capuchin monkeys exhibit significant 'concept' learning abilities, demonstrated by their performance on trial-unique DMTS/DNMTS tasks.
    • Their working memory capabilities are comparable to those reported in the genus Macaca.
    • Cebus apella serves as a valuable model for studying the neurobiological underpinnings of memory.