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Natural choice in nonhuman primates

A Silberberg¹, J J Widholm, D Bresler

¹Department of Psychology, American University, Washington, DC 20016-8062, USA. asilber@american.edu

Journal of Experimental Psychology. Animal Behavior Processes

|April 29, 1998

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Monkeys and apes showed decreased preference for larger food amounts when both options increased proportionally. They also treated food mixtures as single items, suggesting less preferred foods hold no value.

Area of Science:

Animal behavior
Comparative psychology
Primate cognition

Background:

Understanding decision-making processes in non-human primates is crucial for comparative psychology.
Previous theories on animal choice may not fully account for observed primate behaviors.

Purpose of the Study:

To investigate quantity-value relationships in primate food choices.
To explore how non-human primates value components within food mixtures.

Main Methods:

Experiments involved 4 monkeys and 1 ape choosing between two food sources.
Food sources varied in amount and composition, with choices recorded.
Replication experiments were conducted with additional monkeys.

Main Results:

Related Experiment Videos

Preference for larger food amounts decreased as both options increased proportionally.
Subjects showed indifference between a mixture and its preferred component, indicating the less preferred food was devalued.
These findings were consistent across initial and replication experiments.

Conclusions:

Primate choice behavior regarding food quantity and mixtures challenges existing theoretical models.
Results suggest potential cognitive differences in value assessment between non-human primates and humans.