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Third-party expectations of nepotism and mating preferences from facial similary

Abstract : Our relation to our kin shapes much of our social world. It's no surprise then, that how we recognize and react to our own kin has been a widely investigated topic. In particular, when tackling direct kin recognition, facial similarity has emerged as a putative cue of relatedness. In this thesis, I investigate whether or not the same can be said for third party kin recognition. Split between two lines of research, we explore individuals' predictions of nepotistic and mating behavior} in third party scenarios using facial stimuli. These two domains provide the backbone of our research. Categorization must serve action. So, what would strengthen the notion of a presence of third-party kin recognition in humans? Facial similarity \emph{must have} a context-dependent effect on participants predictions, susceptible to valence changes in scenarios and switches from the prosocial and mate choice domains. This is precisely what we set out to do with our two lines of research. Though our literature review revealed that when context is starved participants seem to be able to detect similarity and seemingly connect it to relatedness. Our nepotism and mating series of experiments, by re-inserting context, offers us a different conclusion altogether. Within scenarios in which valence is modified and our participants analysis is bounded by predictions made by kin selection, their choices do no reflect a connection between similarity and relatedness.
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Submitted on : Friday, January 17, 2020 - 4:05:08 PM
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Andrei Ivănescu. Third-party expectations of nepotism and mating preferences from facial similary. Psychology. Université Toulouse le Mirail - Toulouse II, 2017. English. ⟨NNT : 2017TOU20083⟩. ⟨tel-02444135⟩

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