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Related Experiment Video

Updated: Jun 13, 2026

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Behavioral Assessment of Manual Dexterity in Non-Human Primates

Published on: November 11, 2011

Monkeys fail to reciprocate in an exchange task.

Marie Pelé¹, Bernard Thierry, Josep Call

¹Département Ecologie, Physiologie & Ethologie, Institut Pluridisciplinaire Hubert Curien, Centre National de la Recherche Scientifique, Université de Strasbourg, France. marie.pele@c-strasbourg.fr

Animal Cognition

|May 18, 2010

Summary

Monkeys and macaques did not show calculated reciprocity in a token exchange task. Despite opportunities, they did not engage in short-term reciprocal interactions for rewards.

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Area of Science:

Primate behavior
Comparative psychology
Economic behavior

Background:

Economic exchanges are fundamental to human societies.
While animals exhibit reciprocal interactions, complex trading is uniquely human.
Prior research indicates non-human primates can exchange food with humans.

Purpose of the Study:

To investigate the capacity for calculated reciprocity in brown capuchin monkeys and Tonkean macaques.
To determine if these primates could engage in token exchange for mutual benefit.
To understand the cognitive abilities underlying economic trading behaviors.

Main Methods:

A token exchange task was designed where two conspecifics (capuchin monkeys or Tonkean macaques) had to exchange tokens to receive rewards.
Researchers recorded the number and type of token transfers between subjects.
Behavioral observations focused on token manipulation and preferential selection based on partner value.

Main Results:

A total of 56 transfers were observed in capuchin monkeys and 10 in Tonkean macaques, all passive.
Capuchin monkeys showed a preference for tokens valuable to their partners.
No instances of short-term reciprocal interactions were observed, even under optimal conditions.

Conclusions:

Brown capuchin monkeys and Tonkean macaques demonstrated limited capacity for calculated reciprocity.
The cognitive requirements for sophisticated economic trading appear to be beyond the tested primate species.
Further research is needed to explore the evolutionary origins of complex economic behaviors.