Abstract
Emotional expressions provide important clues to other individuals’ emotional states, as well as the environmental situations leading to such states. Although monkeys often modify their behavior in response to others’ expressions, it is unclear whether this reflects understanding of emotional meanings of expressions, or simpler, non-cognitive processes. The present study investigated whether a New World monkey species, tufted capuchin monkeys, recognize objects as elicitors of others’ expressions. Observer monkeys witnessed another individual (demonstrator) reacting either positively or negatively to the contents of one of two containers and were then allowed to choose one of the containers. The observer preferred the container that evoked positive expressions in the demonstrator and avoided the container that evoked negative expressions. Thus, the monkeys appropriately associated the emotional valence of others’ expressions with the container. This finding supports the view that the ability to represent others’ emotions is not limited to humans and apes.
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Acknowledgments
This study was supported by the Japan Society for Promotion of Science (JSPS) Research Fellowship for Young Scientists, No. 216132 to YM, Grants-in-Aid for Scientific Research, Nos. 17300085 and 20220004, to KF, the Japan Ministry of Education, Culture, Sport, Science, and Technology (MEXT) twenty-first Century COE Program, D-10, to Kyoto University and the MEXT Global COE Program, D-07, to Kyoto University. We thank members of the animal laboratory of Department of Psychology, Kyoto University, for their useful advice. We also thank James R. Anderson (University of Stirling) for his helpful comments on the manuscript. All experiments were approved by the Committee for the Animal Experiments, Graduate School of Letters, Kyoto University.
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Morimoto, Y., Fujita, K. Capuchin monkeys (Cebus apella) use conspecifics’ emotional expressions to evaluate emotional valence of objects. Anim Cogn 15, 341–347 (2012). https://doi.org/10.1007/s10071-011-0458-6
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DOI: https://doi.org/10.1007/s10071-011-0458-6