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Spread of arbitrary customs among chimpanzees: a controlled experiment.

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Author(s)

K E Bonnie, Victoria Horner, Andrew Whiten, F B M de Waal

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Abstract

Wild chimpanzees (Pan troglodytes) have a rich cultural repertoire-traditions common in some communities are not present in others. The majority of reports describe functional, material traditions, such as tool use. Arbitrary conventions have received far less attention. In the same way that observations of material culture in wild apes led to experiments to confirm social transmission and identify underlying learning mechanisms, experiments investigating how arbitrary habits or conventions arise and spread within a group are also required. The few relevant experimental studies reported thus far have relied on cross-species (i.e. human-ape) interaction offering limited ecological validity, and no study has successfully generated a tradition not involving tool use in an established group. We seeded one of two rewarded alternative endpoints to a complex sequence of behaviour in each of two chimpanzee groups. Each sequence spread in the group in which it was seeded, with many individuals unambiguously adopting the sequence demonstrated by a group member. In one group, the alternative sequence was discovered by a low ranking female, but was not learned by others. Since the action-sequences lacked meaning before the experiment and had no logical connection with reward, chimpanzees must have extracted both the form and benefits of these sequences through observation of others.

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Details

Original languageEnglish
Pages (from-to)367-372
Number of pages6
JournalProceedings of the Royal Society of London Series B: Biological Sciences
Volume274
Issue number1608
DOIs
Publication statusPublished - 7 Feb 2007

    Research areas

  • social learning, tradition, culture, primates, CHILDREN HOMO-SAPIENS, WILD CHIMPANZEES, PAN-TROGLODYTES, CAPTIVE CHIMPANZEES, ENCULTURATED CHIMPANZEES, CULTURAL TRANSMISSION, SOCIAL CUSTOM, IMITATION, EVOLUTION, BEHAVIOR

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