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Updated: Feb 5, 2026

Testing for Metacognitive Responding Using an Odor-based Delayed Match-to-Sample Test in Rats
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Precise time-matching in chimpanzee allogrooming does not occur after a short delay.

Steve Phelps1, Wing Lon Ng2, Mirco Musolesi3

  • 1Department of Informatics, King's College London, London, United Kingdom.

Plos One
|September 12, 2018
PubMed
Summary

Chimpanzees engage in time-matched grooming reciprocity, but only when grooming is immediate. Delayed reciprocation does not appear to correct past imbalances, suggesting cognitive constraints on social exchange.

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