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Chimpanzees’ (Pan troglodytes) internal arousal remains elevated if they cannot themselves help a conspecific

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Hepach_2020_Chimpanzees_internal_arousal_JCP_AAM.pdf (879.5Kb)
Date
14/12/2020
Author
Hepach, Robert
Vaish, Amrisha
Kano, Fumihoro
Albiach-Serrano, Anna
Benziad, Leïla
Call, Josep
Tomasello, Michael
Keywords
Chimpanzees
Helping
Internal arousal
Pupil dilation
BF Psychology
RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
DAS
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Abstract
Chimpanzees help conspecifics achieve their goals in instrumental situations but neither their immediate motivation nor the evolutionary basis of their motivation are clear. In the current study, we gave chimpanzees the opportunity to instrumentally help a conspecific to obtain food. Following recent studies with human children, we measured their pupil diameter at various points in the process. Like young children, chimpanzees’ pupil diameter decreased soon after they had helped. However, unlike children, chimpanzees’ pupils remained more dilated upon watching a third party provide the needed help instead of them. Our interpretation is that chimpanzees are motivated to help others, and the evolutionary basis is direct or indirect reciprocity, since providing help oneself sets the conditions for a payback. This is in contrast to young children whose goal is to see others being helped –by whomever –presumably because their helping is based not on reciprocity.
Citation
Hepach , R , Vaish , A , Kano , F , Albiach-Serrano , A , Benziad , L , Call , J & Tomasello , M 2020 , ' Chimpanzees’ ( Pan troglodytes ) internal arousal remains elevated if they cannot themselves help a conspecific ' , Journal of Comparative Psychology , vol. Advance online . https://doi.org/10.1037/com0000255
Publication
Journal of Comparative Psychology
Status
Peer reviewed
DOI
https://doi.org/10.1037/com0000255
ISSN
0735-7036
Type
Journal article
Rights
Copyright © 2020 American Psychological Association. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://psycnet.apa.org/PsycARTICLES/journal/com
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  • University of St Andrews Research
URL
https://doi.org/10.1037/com0000255.supp
URI
http://hdl.handle.net/10023/20529

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