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Oxytocin reduces food sharing in capuchin monkeys by modulating social distance

In: Behaviour
Authors:
Sarah F. BrosnanaLanguage Research Center, Georgia State University, Atlanta, GA 30034, USA
bDepartment of Psychology, Georgia State University, P.O. Box 5010, Atlanta, GA 30302, USA
cNeuroscience Institute and Department of Philosophy, Georgia State University, Atlanta, GA 30302, USA

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Catherine F. TalbotaLanguage Research Center, Georgia State University, Atlanta, GA 30034, USA
bDepartment of Psychology, Georgia State University, P.O. Box 5010, Atlanta, GA 30302, USA

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Jennifer L. EssleraLanguage Research Center, Georgia State University, Atlanta, GA 30034, USA

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Kelly LeverettaLanguage Research Center, Georgia State University, Atlanta, GA 30034, USA

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Timothy FlemmingaLanguage Research Center, Georgia State University, Atlanta, GA 30034, USA
bDepartment of Psychology, Georgia State University, P.O. Box 5010, Atlanta, GA 30302, USA

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Patrick DougallaLanguage Research Center, Georgia State University, Atlanta, GA 30034, USA

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Carla HeyleraLanguage Research Center, Georgia State University, Atlanta, GA 30034, USA

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Paul J. ZakdThe Center for Neuroeconomic Studies, Claremont Graduate University, Claremont, CA 91711, USA

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Recent evidence indicates that oxytocin plays an important role in promoting prosocial behaviour amongst humans and other species. We tested whether oxytocin affected cooperation and food-sharing in capuchin monkeys, a highly cooperative New World primate. Subjects received either 2IU oxytocin or an inert adjuvent intranasally prior to each session. Oxytocin influenced food sharing in capuchins in ways we did not anticipate. Recipients were less likely to passively acquire food from possessors when either individual had received OT than in the control, and also spent less time in proximity to their partner. Passive food sharing requires proximity, and oxytocin decreased the capuchins’ typical congregating behaviour, apparently resulting in decreased sharing. We propose that the likely mechanism for increased social distance is the known anxiolytic effect of oxytocin. Our results indicate a need to consider how oxytocin affects the context of interactions and interacts with modes of sociality unique to each species.

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