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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Research has shown that we human beings not only consider how best to maximize our compensation, but we also factor in such notions as cooperation and fairness when we make our decisions. More like this AIG and Inequality. Post was not sent – check your email addresses!

Chimpanzees, however, go about the ultimatum game which involves divisions of raisins in their case without giving fairness any thought. MelisaBrian HarebMichael Tomaselloa Jonah, Your post and this study begs a question I’ve been pondering in regard to the research on autism and other developmental disabilities that I’m involved in as to whether the TOM piece of the equation is always necessarily a deficit.

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

Here’s the Science paper. Humans typically make offers close to 50 percent of the reward. In another recent paper, Brosnan et al. Chimpanzees are rational maximizers in an ultimatum game. Chimps play fair in the ultimatum game.

What’s in it for me? How is it’s development affected by environment? Evolution and the mechanisms of decision making 11, The endowment effect is a bias that make us placing a higher value on objects we own relative to objects we do not.


It is perfectly rational to play a risky game: There has been no great risk shift, at least….


He and his colleagues setup a game where a human or chimpanzee receives something of value, and is able to share it with another. We are not unique,” Milinski told LiveScience. When proposers do something to deserve their riches – like score high on a trivia quiz – nobody complains. Seuraavat artikkelit on yhdistetty Scholar-palvelussa. Endowment Effects in Chimpanzees. This paper has been referenced on Twitter 14 times over the past 90 days.

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The apparatus, which has two sliding trays connected by a single rope, is outside of the cages.

The first variable is theory of mind TOM. Chimps had to split grapes. In this case, then, animals are more rational than we are. 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.

Generally speaking, humans made offers close to 50 percent of the reward, but chimpanzees almost consistently made offers of substantially less than 50 percent, and accepted offers of any size, no matter how small. Humans aren’t the only ones who cry “no fair.

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Chimps Have a Sense of Fairness

The ratjonal variable is what we’ll call “the fairness instinct”. It is the art of science. She has a master’s degree in bioengineering from the University of Washington and a graduate certificate in science writing from the University of California Santa Cruz. I recently discussed the experimental study of the Ultimatum Game, and showed that it has been studied in economics, psychology, anthropology, psychophysics and genetics.

It’s not that the primates demanded equality – some capuchins collected many more pebbles than others, and that never created a problem – it’s that they couldn’t stand when the inequality was a result of injustice. Newer Post Older Post Home. Harcourt Animal Behaviour Citations Publications citing this paper.

The findings, published today Jan. I had completely missed upon the ToM angle, when I first read about this study. Yet, in certain contexts, the neocortex can cause us not to maximize our self-interest.

David Leonhardt has an excellent column on the squeezed middle class.

Dr. Keith Jensen – Google Scholar -sitaatit

From This Paper Figures, tables, and topics from this paper. Notify me about Research projects. Tia maximziers interned at Science News, Wired. Proceedings of the National Academy of Sciences,