Animal Cognition

, Volume 17, Issue 5, pp 1167–1176 | Cite as

A reversed-reward contingency task reveals causal knowledge in chimpanzees (Pan troglodytes)

Original Paper

Abstract

In the reversed-reward contingency task, subjects are required to choose the less preferred of two options in order to obtain the more preferred one. Usually, this task is used to measure inhibitory skills, but it could also be used to measure how strong the subjects’ preferences are. We presented chimpanzees with support tasks where only one of two paper strips could physically bring food into reach. Subjects were rewarded for choosing the non-functional strip. In Experiment 1, subjects failed to pick the non-baited strip. In Experiment 2, subjects failed to pick the broken strip. Chimpanzees performed worse in these tasks than in other similar tasks where instead of paper strips, there were similar shapes painted on a platform. The fact that subjects found the reversed-reward contingency task based on causality more difficult to solve than a perceptually similar task with no causality involved (i.e., arbitrary) suggests that they did not treat real strips as an arbitrary task. Instead, they must have had some causal knowledge of the support problem that made them prefer functional over non-functional strips despite the contrary reward regime.

Keywords

Reversed-reward contingency Inhibition Support Causal knowledge Chimpanzees 

Notes

Acknowledgments

We would like to thank the keepers of Pongoland, in Leipzig Zoo, for providing help with the chimpanzees. Also, we are grateful to James Close for the proof reading of this article. Finally, we acknowledge the comments of two anonymous reviewers on a previous version of this manuscript.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical standards

This study strictly adhered to the legal requirements of the country in which it was conducted.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Ethology and Animal Welfare SectionUniversidad CEU Cardenal HerreraValenciaSpain
  2. 2.School of Psychology and NeuroscienceUniversity of St AndrewsSt AndrewsScotland, UK
  3. 3.Max Planck Institute for Evolutionary AnthropologyLeipzigGermany

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