Conformity to cultural norms of tool use in chimpanzees (original) (raw)

Nature volume 437, pages 737–740 (2005)Cite this article

Abstract

Rich circumstantial evidence suggests that the extensive behavioural diversity recorded in wild great apes reflects a complexity of cultural variation unmatched by species other than our own1,2,3,4,5,6,7,8,9,10,11,12. However, the capacity for cultural transmission assumed by this interpretation has remained difficult to test rigorously in the field, where the scope for controlled experimentation is limited13,14,15,16. Here we show that experimentally introduced technologies will spread within different ape communities. Unobserved by group mates, we first trained a high-ranking female from each of two groups of captive chimpanzees to adopt one of two different tool-use techniques for obtaining food from the same ‘Pan-pipe’ apparatus, then re-introduced each female to her respective group. All but two of 32 chimpanzees mastered the new technique under the influence of their local expert, whereas none did so in a third population lacking an expert. Most chimpanzees adopted the method seeded in their group, and these traditions continued to diverge over time. A subset of chimpanzees that discovered the alternative method nevertheless went on to match the predominant approach of their companions, showing a conformity bias that is regarded as a hallmark of human culture11.

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Acknowledgements

This project was conducted at the Yerkes National Primate Research Center's Field Station and supported by a project grant from the BBSRC to A.W., by the National Institutes of Health, the Living Links Center of Emory University and the University of St Andrews. A.W. was supported by a Leverhulme Fellowship. We are grateful to M. Dindo, K. Bonnie, J. Rybak and Yerkes Field Station Engineering for logistical support. We also thank Yerkes' animal care and veterinary staff for maintaining the health of the chimpanzees. We are grateful to A. Burnley for construction of the Pan-pipes and to G. Brown, E. Flynn, K. Laland and A. Mesoudi for comments on manuscripts. The Yerkes Center is fully accredited by the American Association for Accreditation for Laboratory Animal Care.

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Authors and Affiliations

  1. Centre for Social Learning and Cognitive Evolution, School of Psychology, University of St Andrews, St Andrews, Fife, KY16 9JP, UK
    Andrew Whiten & Victoria Horner
  2. Living Links, Yerkes National Primate Research Center, Emory University, Georgia, 30322, Atlanta, USA
    Victoria Horner & Frans B. M. de Waal

Authors

  1. Andrew Whiten
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  2. Victoria Horner
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  3. Frans B. M. de Waal
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Corresponding author

Correspondence toAndrew Whiten.

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Supplementary information

Supplementary Methods

Procedures, coding and statistics details, additional to those in the main article. (DOC 27 kb)

Supplementary Table S1

Individual characteristics and rearing history. (DOC 72 kb)

Supplementary Table S2

Latency to success. For each individual, lists cumulative time from gaining access to the task, to first successful tool use. (DOC 33 kb)

Supplementary Table S3

Total frequencies of Poke and Lift. For each individual, lists total Poke and Lift acts in T1 and T2. (DOC 52 kb)

Supplementary Table S4

For each individual, lists the frequencies of Poke and Lift relevant to classification and statistics in Table 1 in the article. (DOC 33 kb)

Supplementary Video S1

Pan-pipe Lift technique by human, side-view. (MPG 2257 kb)

Supplementary Video S2

Pan-pipe Poke technique by human, side-view. (MPG 3322 kb)

Supplementary Video S3

Pan-pipe Lift technique by human, frontal (chimpanzee-eye) view. (MPG 1745 kb)

Supplementary Video S4

Pan-pipe Poke technique by human, frontal (chimpanzee-eye) view. (MPG 2286 kb)

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Whiten, A., Horner, V. & de Waal, F. Conformity to cultural norms of tool use in chimpanzees.Nature 437, 737–740 (2005). https://doi.org/10.1038/nature04047

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Editorial Summary

In with the in-crowd

Humans are not alone in wanting to fit in: chimpanzees also conform to the cultural norm. It is well known that chimpanzees sustain different local traditions of tool-use, but a new study shows that they conform to the group norms in an unexpectedly human-like way. By training one individual in each of two groups to use a tool to extract hidden food in different ways, various technologies were ‘seeded’ into social groups. These developed into stable subcultures during the two-month study. Some individuals stumbled on the alternative method, yet converged on the local group norm. Human conformity to local custom may have a much more ancient evolutionary ancestry than was assumed.