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Majority-biased learning
Date:4/12/2012

s if they dropped a ball into a hole. Four individuals then demonstrated an action: One individual dropped a ball into the same section three times; the three others one after the other - dropped their balls into another section. Finally, the observers were also asked to drop a ball into one of the three sections. The result: Most of the chimpanzees and 16 children chose the section that the majority of individuals had also chosen. Orangutans appeared to select a section quite randomly.

In the second part of the study, the researchers analysed whether the frequency with which a subsection was chosen by the demonstrators had an influence on the result. The set-up was similar to the previous test, with one exception: now it was only two children, chimpanzees or orangutans who demonstrated an action. One individual dropped three balls into one of the coloured subsections and for doing this received one reward per ball. The second demonstrator dropped one ball in a differently coloured section and received one award. The result: Chimpanzees and orangutans seemed to choose randomly whereas most of the children chose the subsection into which more balls had been dropped.

"Taking the results of the two studies together, chimpanzees seemed to consider the number of demonstrators more strongly than the number of demonstrations when deciding which information to extract from their social environment. Children considered both. Orangutans considered neither", says Daniel Haun. Interestingly, children and chimpanzees copied the majority behaviour while orangutans did not. One possible explanation: Contrary to humans and chimpanzees, orangutans live together in lose group structures. Social learning beyond the mother-child-relationship might therefore not play an equally important role.


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Contact: Dr. Daniel Haun
haun@eva.mpg.de
49-341-355-0815
Max-Planck-Gesellschaft
Source:Eurekalert  

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