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Neumann, Christof

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Neumann, Christof
Affiliation principale
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https://libra.unine.ch/handle/123456789/922

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  • Publication
    Accès libre
    Assessing joint commitment as a process in great apes.
    (2021-08-20T00:00:00Z)
    Heesen, Raphaela 
    ;
    Bangerter, Adrian 
    ;
    Zuberbühler, Klaus 
    ;
    Iglesias, Katia 
    ;
    Neumann, Christof 
    ;
    Pajot, Aude
    ;
    Perrenoud, Laura
    ;
    Guéry, Jean-Pascal
    ;
    Rossano, Federico
    ;
    Genty, Emilie 
    Many social animals interact jointly, but only humans experience a specific sense of obligation toward their co-participants, a . However, joint commitment is not only a mental state but also a that reveals itself in the coordination efforts deployed during entry and exit phases of joint action. Here, we investigated the presence and duration of such phases in  = 1,242 natural play and grooming interactions of captive chimpanzees and bonobos. The apes frequently exchanged mutual gaze and communicative signals prior to and after engaging in joint activities with conspecifics, demonstrating entry and exit phases comparable to those of human joint activities. Although rank effects were less clear, phases in bonobos were more moderated by friendship compared to phases in chimpanzees, suggesting bonobos were more likely to reflect patterns analogous to human "face management". This suggests that joint commitment as process was already present in our last common ancestor with .
  • Publication
    Accès libre
    Complex patterns of signalling to convey different social goals of sex in bonobos, Pan paniscus
    (2015)
    Genty, Emilie 
    ;
    Neumann, Christof 
    ;
    Zuberbühler, Klaus 
    Sexual behaviour in bonobos (Pan paniscus) functions beyond mere reproduction to mediate social interactions and relationships. In this study, we assessed the signalling behaviour in relation to four social goals of sex in this species: appeasement after conflict, tension reduction, social bonding and reproduction. Overall, sexual behaviour was strongly decoupled from its ancestral reproductive function with habitual use in the social domain, which was accompanied by a corresponding complexity in communication behaviour. We found that signalling behaviour varied systematically depending on the initiator's goals and gender. Although all gestures and vocalisations were part of the species-typical communication repertoire, they were often combined and produced flexibly. Generally, gestures and multi-modal combinations were more flexibly used to communicate a goal than vocalisations. There was no clear relation between signalling behaviour and success of sexual initiations, suggesting that communication was primarily used to indicate the signaller's intention, and not to influence a recipient's willingness to interact sexually. We discuss these findings in light of the larger question of what may have caused, in humans, the evolutionary transition from primate-like communication to language.
  • Publication
    Accès libre
    Bonobos modify communication signals according to recipient familiarity
    (2015)
    Genty, Emilie 
    ;
    Neumann, Christof 
    ;
    Zuberbühler, Klaus 
    Human and nonhuman primate communication differs in various ways. In particular, humans base communicative efforts on mutual knowledge and conventions shared between interlocutors. In this study, we experimentally tested whether bonobos (Pan paniscus), a close relative to humans, are able to take into account the familiarity, i.e. the shared interaction history, when communicating with a human partner. In five experimental conditions we found that subjects took the recipients' attentional state and their own communicative effectiveness into account by adjusting signal production accordingly. More importantly, in case of communicative failure, subjects repeated previously successful signals more often with a familiar than unfamiliar recipient, with whom they had no previous interactions, and elaborated by switching to new signals more with the unfamiliar than the familiar one, similar to what has previously been found in two year-old children. We discuss these findings in relation to the human capacity to establish common ground between interlocutors, a crucial aspect of human cooperative communication.