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Long-tailed macaques display unexpected waiting abilities in exchange tasks
Marie Pelé1, Valérie Dufour, Jérôme Micheletta
1Département Ecologie, Physiologie et Ethologie, IPHC, Centre National de la Recherche Scientifique, Université de Strasbourg, 23 rue Becquerel, Strasbourg, France. marie.pele@c-strasbourg.fr
Animal Cognition
|July 15, 2009
Summary
Long-tailed macaques demonstrated significant delay of gratification abilities, waiting up to 10 minutes for larger rewards. Their capacity for delayed gratification was enhanced by inhibiting consumption, suggesting cognitive control in decision-making.
Area of Science:
- Animal behavior
- Cognitive science
- Primate research
Background:
- Delay of gratification is vital for goal-directed actions and decision-making in animals.
- Previous research has not established such abilities in non-human primates like monkeys.
Purpose of the Study:
- To investigate the delay of gratification capabilities in long-tailed macaques (Macaca fascicularis).
- To explore the role of consumption inhibition in postponing gratification.
Main Methods:
- Subjects participated in exchange tasks requiring them to hold a small reward before receiving a larger one.
- Experiments involved immediate return of initial reward versus waiting for a delayed, larger reward.
- A third experiment tested responses to accumulating rewards at short intervals.
Main Results:
- Macaques could delay gratification for periods ranging from 10 seconds to 10 minutes, varying with individual and reward size.
- Performance improved significantly when consumption inhibition was employed.
- Wait times for accumulating rewards were consistently between 30 seconds and 1 minute.
Conclusions:
- Long-tailed macaques exhibit notable delay of gratification, previously thought impossible in monkeys.
- These abilities suggest anticipation of delay durations and cognitive control.
- Social context achievements may contribute to their remarkable delay of gratification performances.
