Can Monkeys Make Investments Based on Maximized Pay-off?
Author Information
Author(s): Sophie Steelandt, Valérie Dufour, Marie-Hélène Broihanne, Bernard Thierry
Primary Institution: Centre National de la Recherche Scientifique, Département Ecologie, Physiologie et Ethologie, Strasbourg, France
Hypothesis
Can monkeys use different investment strategies in an exchange task based on expected pay-offs?
Conclusion
Only one of the 21 monkeys learned to maximize benefits by adapting their investment according to the quality of the experimenters.
Supporting Evidence
- Most monkeys failed to maximize pay-offs by using different decision rules with each partner's quality.
- One Tonkean macaque succeeded in investing a maximal amount to one experimenter and a minimal amount to the other.
- Subjects exhibited different ways to remove raisins from the initial amount during the task.
Takeaway
The study tested monkeys to see if they could give the right amount of food to get more in return, but most couldn't figure it out.
Methodology
Monkeys were tested in an exchange task with two different experimenters who offered different pay-offs based on the amount of food returned.
Potential Biases
The experimental design may have influenced the monkeys' ability to learn the task.
Limitations
Only one subject successfully adapted their strategy, indicating that the task was difficult for most monkeys.
Participant Demographics
The study involved eight tufted capuchin monkeys, thirteen macaques (including Tonkean and long-tailed macaques).
Statistical Information
P-Value
p=0.016
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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