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Title: Divergent effects of oxytocin on eye contact in bonobos and chimpanzees
Authors: Brooks, James
Kano, Fumihiro
Sato, Yutaro
Yeow, Hanling
Morimura, Naruki  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-9117-4828 (unconfirmed)
Nagasawa, Miho
Kikusui, Takefumi
Yamamoto, Shinya  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7556-6151 (unconfirmed)
Author's alias: ブルークス, ジェームズ
狩野, 文浩
佐藤, 侑太郎
森村, 成樹
永澤, 美保
菊水, 健史
山本, 真也
Keywords: Oxytocin
Eye contact
Bonobos
Chimpanzees
Species differences
Social attention
Issue Date: Mar-2021
Publisher: Elsevier BV
Journal title: Psychoneuroendocrinology
Volume: 125
Thesis number: 105119
Abstract: Oxytocin has drawn significant research attention for its role in modulating mammalian social behavior. Despite generally conserved roles, oxytocin can function differently even in closely related species. Previous studies have shown that bonobos and chimpanzees, humans’ two closest relatives, demonstrate considerable behavioral differences, including that bonobos look more at others’ eyes than chimpanzees. Oxytocin is known to increase attention to another’s eyes in many mammalian species (e.g. dogs, monkeys, and humans), yet this effect has not been tested in any nonhuman great ape species. This study examined how intranasally-administered oxytocin affects eye contact in bonobos and chimpanzees using eye tracking. Following administration of either oxytocin or saline control with a nebulizer, chimpanzees (n = 6) and bonobos (n = 5) were shown images of conspecific faces while their eye movement was recorded. Oxytocin changed the eye-looking behavior of bonobos and chimpanzees differently. We found that oxytocin increased eye contact in bonobos but not chimpanzees; while one chimpanzee showed an increase, interestingly, 5 out of 6 chimpanzees showed decreased looking to the eyes compared to the mouth, suggesting moderate eye avoidance. Given the importance of eye contact in their social interactions, our results suggest that oxytocin may play modulatory roles in bonobos’ and chimpanzees’ species-specific social behavior and underscore the importance of oxytocin in hominid social evolution.
Description: ボノボとチンパンジーのアイ・コンタクトにおけるオキシトシン噴霧投与の効果を確認. 京都大学プレスリリース. 2021-01-08.
Rights: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
The full-text file will be made open to the public on 1 March 2022 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/260851
DOI(Published Version): 10.1016/j.psyneuen.2020.105119
PubMed ID: 33388536
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2021-01-08
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