Here we show that in an ultimatum game, humans’ closest living relatives, chimpanzees (Pan troglodytes), are rational maximizers and are not sensitive to. In these studies, the authors concluded that chimpanzees were rational maximizers, making low offers that were mostly accepted. However, the. Reference: Keith Jensen, Josep Call, Michael Tomasello Chimpanzees are rational maximizers in an ultimatum game, Science, October 5.

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They are even worse at saving than we are! I wonder how the “fairness instinct” develops in primates and humans.

BTW, I’m enjoying your book. Journal of Political Economy, 3 The monkeys were willing to forfeit cheap food simply to register their rage at the arbitrary pay scale. Endowment Effects in Chimpanzees.

Michael Tomaselloone of the biggest and best primatologists out there, recently published a paper in Science on chimpanzee rationality. The proposer, who makes the first choice, sits to the responder’s left.

Chimpanzees are rational maximizers in an ultimatum game.

Chimpanzees may recognize motives and goals, but may not reckon on them J Call, K Jensen Empathy and fairness, 56 Chimpanzees are rational maximizers in an ultimatum game K Jensen, J Call, M Tomasello science, Touch-screen-guided task reveals a prosocial choice tendency by chimpanzees Pan troglodytes Renata S. As citizens we expect that when we contribute our fair share we should receive our just reward.


One recipient even spit a mouthful of water at its partner, Proctor said. I think it will be interesting to disentangle two different variables which might be at work here.

Chimpanzee Rationality |

Skip to search form Skip to main content. Johan, great article as usual. Topics Discussed in This Paper.

The endowment effect is a bias that make us placing a higher value on objects we own relative to objects we do not. In this way, they protect their self interest and are unwilling to pay a cost to punish someone they perceive as unfair. In the game, a human or chimpanzee who receives something of value can offer to share it with another. German researchers have demonstrated chimpanzees make choices that protect their self-interest more consistently than rafional humans.


This labor unrest among monkeys illuminates our innate sense of fairness. Have Questions for the blog?

Harcourt Animal Behaviour Science, Quine I am a monomaniac. Proceedings of the National Academy of Sciences 32, Well, chimps do that too. Mqximizers and crew concluded that chimpanzees do not show a willingness to make fair offers and reject unfair ones.

That suggested their main goal — getting more tasty raisins — overrode any meager sense of fairness they may have had. Encyclopedia of animal behavior volume 2, Except, this is not what happens. Click to email this to a friend Opens in new window Click to print Opens in new window Click to share on Facebook Opens in new window Click to share on Twitter Opens in new window Click to share on Reddit Opens in new window.


They also reject as unfair offers of significantly less than half of the reward, even though this choice means they get nothing. The authors of this study argue that chimps might have a lessened aversion to acts of unfairness. The emergence of human prosociality: Showing of gmae citations. Chimpanzees, however, go about the ultimatum game which involves divisions of raisins in their case without giving fairness maximizer thought.

Chimpanzees Are Rational Maximizers in an Ultimatum Game by Lisa Hornak on Prezi Next

In one of the most robust tests of this finding, the ultimatum game, individuals will reject a proposed division of a monetary windfall, at a cost to themselves, if they perceive it as unfair. He and his colleagues setup a game where a human or chimpanzee receives something of value, and ultimaum able to share it with another.

He found some interesting results.

Newer Post Older Post Home. In my observation the “fairness instinct” is stronger in some and weaker in others. If the proposed share chimpanzese rejected, neither player gets anything.