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Humanity at first sight: Exploring the relationship between others' pupil size and ascriptions of humanity

Delgado, N; Mattavelli, S; Brambilla, M; Rodríguez-Gómez, L; Harris, LT; (2023) Humanity at first sight: Exploring the relationship between others' pupil size and ascriptions of humanity. Journal of Experimental Social Psychology , 106 , Article 104455. 10.1016/j.jesp.2023.104455. Green open access

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Abstract

Social targets' eyes are a rich source of information: partners with dilated and constricted pupils are perceived positively and negatively, respectively. Here, we tested whether observed pupil size influences the ascription of humanity. In Study 1 (n = 198) participants were asked to attribute positive uniquely human and non-uniquely human traits to ingroup (i.e., university students), derogated (i.e., homeless people) and non-derogated (i.e., Dutch) targets whose pupils varied in size. Results showed higher attribution of uniquely human traits to targets with dilated (vs. constricted) pupils, whereas no difference based on pupil size emerged on the attribution of non-uniquely human traits. The effect was stronger for non-derogated (vs. derogated and ingroup) targets. In Study 2 (n = 117) participants were asked to attribute positive uniquely human and non-uniquely human traits and emotions. Results replicated the effect of pupil size on trait attribution, especially for outgroup (vs. ingroup) members. The effect of pupil size was not qualified by emotions type (uniquely human vs. non uniquely human). Taken together, our findings show that pupil size is interpreted as a cue to attribute humanity to social targets.

Type: Article
Title: Humanity at first sight: Exploring the relationship between others' pupil size and ascriptions of humanity
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.jesp.2023.104455
Publisher version: https://doi.org/10.1016/j.jesp.2023.104455
Language: English
Additional information: © 2023 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
Keywords: Dehumanization, Pupil size, Social cognition, Face perception
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Experimental Psychology
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10165439
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