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Bonobos (Pan paniscus) vocally protest against violations of social expectations.

Clay, Zanna and Ravaux, Lucie and de Waal, Frans B. M. and Zuberbühler, Klaus (2016) 'Bonobos (Pan paniscus) vocally protest against violations of social expectations.', Journal of comparative psychology., 130 (1). pp. 44-54.

Abstract

Research has shown that great apes possess certain expectations about social regularities and both perceive and act according to social rules within their group. During natural and experimentally induced contexts, such as the inequitable distribution of resources, individuals also show protesting behaviors when their expectations about a social situation are violated. Despite broad interest in this topic, systematic research examining the nature of these expectations and the communicative signals individuals use to express them remains scant. Here, we addressed this by exploring whether bonobos (Pan paniscus) respond to violations of social expectations in naturally occurring social interactions, focusing on the vocal behavior of victims following socially expected and unexpected aggression. Expected aggression included conflicts over a contested resource and conflicts that were provoked by the victim. Unexpected aggression was any spontaneous, unprovoked hostility toward the victim. For each conflict, we also determined its severity and the composition of the nearby audience. We found that the acoustic and temporal structure of victim screams was individually distinct and varied significantly depending on whether or not aggression could be socially predicted. Certain acoustic parameters also varied as a function of conflict severity, but unlike social expectation, conflict severity did not discriminate scream acoustic structure overall. We found no effect of audience composition. We concluded that, beyond the physical nature of a conflict, bonobos possess certain social expectations about how they should be treated and will publicly protest with acoustically distinctive vocal signals if these expectations are violated.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1037/a0040088
Publisher statement:© 2016 APA, all rights reserved. This article may not exactly replicate the final version published in the APA journal. It is not the copy of record.
Date accepted:28 September 2015
Date deposited:24 June 2019
Date of first online publication:01 February 2016
Date first made open access:24 June 2019

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