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Summary

This summary is machine-generated.

Humans and chimpanzees exhibit similar fairness behaviors in reward division tasks. Both species prefer equal splits when cooperation is needed, but choose selfish options when partners are passive, suggesting an ancient evolutionary basis for fairness.

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Area of Science:

Behavioral Economics
Primatology
Developmental Psychology

Background:

Human fairness in reward division is often studied using the ultimatum game, revealing a tendency for generous offers.
Previous experiments indicate that non-human primates have not demonstrated similar fairness tendencies.

Purpose of the Study:

To investigate whether the human sense of fairness is uniquely human.
To compare reward division preferences between chimpanzees and human children using a modified ultimatum game.

Main Methods:

A modified ultimatum game was employed with chimpanzees (Pan troglodytes) and human children.
Participants chose between two tokens: one offering equal rewards, the other favoring the chooser.
Partner cooperation was manipulated to simulate ultimatum and dictator game conditions.

Main Results:

Both chimpanzees and human children exhibited equitable reward distribution when partner cooperation was required.
When partners were passive (dictator game condition), both groups preferred the self-beneficial option.
Behavioral responses in reward division were similar across species and developmental stages.

Conclusions:

Humans and chimpanzees display comparable reward division preferences.
The findings suggest that the foundations of human fairness have a long evolutionary history.
Fairness in reward allocation may not be a uniquely human trait.