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Monkeys show reciprocity in social exchanges, but only when negative outcomes are involved. This suggests macaque social cognition includes revenge and gratitude, clarifying previous research findings.

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Area of Science:

  • Primate social cognition
  • Animal behavior
  • Neuroscience

Background:

  • Primates form social networks by adapting behavior based on past interactions.
  • Reciprocity is observed in free-ranging primates but difficult to replicate experimentally.
  • Understanding the cognitive and neural basis of reciprocity in monkeys remains a challenge.

Purpose of the Study:

  • To investigate the presence and nature of reciprocity in macaque social decision-making.
  • To determine the conditions under which monkeys reciprocate during social exchanges.
  • To explore the roles of revenge and gratitude in primate social cognition.

Main Methods:

  • Pairs of long-tailed macaques (Macaca fascicularis) participated in a social decision task.
  • Task involved reciprocal delivery of positive (juice) or negative (airpuff) outcomes.
  • Analysis focused on how one partner's past decisions influenced the other's future choices.

Main Results:

  • Reciprocity was demonstrated, but exclusively for the exchange of negative outcomes.
  • Observing a partner's decisions was crucial for this reciprocity; non-social deliveries had no effect.
  • Withholding negative outcomes also predicted future decisions, indicating potential gratitude.

Conclusions:

  • Macaque social cognition encompasses reciprocity, specifically in negative outcome exchanges.
  • The findings suggest that revenge and gratitude may motivate tit-for-tat strategies in monkeys.
  • This study reconciles conflicting literature on primate reciprocity and deepens understanding of their social cognitive abilities.