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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He found some interesting results. Decision-making is my intellectual passion.

Chimpanzees are rational maximizers in an ultimatum game.

Notify me about Research projects. Evolution, then, is a mixed blessing: Skip to search form Skip to main content. Five-year-olds understand fair as equal in a mini-ultimatum game M Wittig, K Jensen, M Tomasello Journal ratiional experimental child psychology 2, The emergence of human prosociality: Or at least they play the ultimatum game more rationally than humans:. Empirical research has demonstrated, however, that people will take into account the interests of others and are sensitive to norms of cooperation and fairness.

Patterns of Behavior Alexander H. Those studies, however, instantly started a new round of the game if the apes accepted, but made them wait a full minute after rejecting the offer, raising the possibility that the apes realized it was more fruitful to accept quickly to get more raisins, rather than rejecting low-ball offers. Chimps Are More Rational facebook twitter reddit linkedin email print. Johan, great article as usual. Another chimpaznees study Chen et al, also indicates that capuchin monkeys exhibit loss-aversion.

Citations Publications citing this paper.

Tomasello 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.


The joke about on apparent rise in diagnoses of Asperger’s these days is that 40 years ago we just called them all ‘engineers.

B The responder can then pull the attached rod, now within reach, to bring the proposed food tray to the cage mesh so that C both subjects can eat from their respective food dishes clearly separated by a translucent divider Results indicate the chimps behave like Homo Economicus: The monkeys were willing to forfeit cheap food simply to register their rage at the arbitrary pay scale.

The second variable is what we’ll call “the fairness instinct”.

But there are several other studies which have concluded that the fairness instinct is a basic element of primate morality. More like this AIG and Inequality. Chimps and children In the new study, the team trained the primates to dole out tokens that stood for bananas, with one token symbolizing an equal split, while the other was an unfair deal that benefitted the first chimp.

The findings, published today Jan. Further evidence for this line of argument comes from studies of autistic adults playing the ultimatum game, who also act like rational maximizers.

Chimpanzees Are Rational Maximizers in an Ultimatum Game : science

And conversely, the chimp proposers rarely suggested a fair division, choosing instead to maximize their own share. The first chimpanaees is theory of mind TOM. The little ones started out greedy but quickly offered the tokens for fairer distributions of stickers.

It is perfectly rational to play a risky game: At first the chimps were stingybut very quickly, they switched to offering equitable splits in the ultimatum game. Oma profiili Oma kirjasto Tiedot Ilmoitukset. These results support the hypothesis that other-regarding preferences and aversion to inequitable outcomes, which play key roles in human social organization, distinguish us from our closest living relatives.


Chimpanzes it be a useful deviation in our varied gene pool if everyone were not expected to excel in the same way and if this difference were well applied? The Chimpanzees of Gombe. Jonah, Your post and this study begs a chimpannzees I’ve been pondering in regard to the research on autism and other developmental cimpanzees that I’m involved in as to whether the TOM piece of the equation is always necessarily a deficit. How is it’s development affected by environment?

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I wonder how an environment of scarcity might skew the results of the ultimatum game. Chimpanzees are rational maximizers in an ultimatum game K Jensen, J Call, M Tomasello science, This behavior is of course wonderfully human — but it is not part of the standard rational model. Humans typically make offers close to 50 percent of the reward. Chimpanzees may recognize motives and goals, but may not reckon on them J Call, K Jensen Empathy and fairness, 56 Post was not sent – check your email addresses!

Tia has interned at Science News, Wired. Proceedings of the National Academy of Sciences 32, This labor unrest among monkeys illuminates our innate sense of fairness. Over at the Economist, Jason Furman worries about the long-term implications of growing societal inequality: