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Fogiel AZ, Hermes J, Rakoczy H, Diesendruck G. Infants' biased individuation of in-group members. Cognition 2023; 239:105561. [PMID: 37454528 DOI: 10.1016/j.cognition.2023.105561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 07/03/2023] [Accepted: 07/10/2023] [Indexed: 07/18/2023]
Abstract
Adults tend to construe members of their group as "unique individuals" more than members of other groups. This study investigated whether infants exhibit this tendency, even in regard to unfamiliar arbitrary groups. Ninety-six White 1-year-olds were assigned to an Ingroup, Outgroup, or No-Group condition, based on whether or not they shared two preferences (food and shirt color) with women appearing on video sequences. In the critical trial, infants saw two women (Ingroup, Outgroup, or No-Group) - one at a time - appearing from behind a curtain. The curtain opened to reveal only one woman. Infants in the Ingroup condition looked longer at this display than infants in the other two conditions. This suggests that infants in the Ingroup condition had a stronger expectation than those in the other two conditions that there would be two women behind the curtain. In other words, infants individuated in-group members more than out-group members.
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Affiliation(s)
- Adi Zehavi Fogiel
- Department of Psychology, Gonda Brain Research Center, Bar-Ilan University, Ramat-Gan 5290002, Israel
| | - Jonas Hermes
- Department of Developmental Psychology, University of Goettingen, 37073 Goettingen, Germany
| | - Hannes Rakoczy
- Department of Developmental Psychology, University of Goettingen, 37073 Goettingen, Germany
| | - Gil Diesendruck
- Department of Psychology, Gonda Brain Research Center, Bar-Ilan University, Ramat-Gan 5290002, Israel.
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Neoh MJY, Setoh P, Bizzego A, Tandiono M, Foo JN, Lee A, Bornstein MH, Esposito G. Gene-Environment Interactions in Face Categorization: Oxytocin Receptor Genotype x Childcare Experience Shortens Reaction Time. Front Psychol 2022; 13:873676. [PMID: 35756198 PMCID: PMC9222134 DOI: 10.3389/fpsyg.2022.873676] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 05/05/2022] [Indexed: 01/18/2023] Open
Abstract
Human faces capture attention, provide information about group belonging, and elicit automatic prepared responses. Early experiences with other-race faces play a critical role in acquiring face expertise, but the exact mechanism through which early experience exerts its influence is still to be elucidated. Genetic factors and a multi-ethnic context are likely involved, but their specific influences have not been explored. This study investigated how oxytocin receptor gene (OXTR) genotypes and childcare experience interacted to regulate face categorization in adults. Information about single nucleotide polymorphisms of OXTR (rs53576) and experiences with own- and other-race child caregivers was collected from 89 Singaporean adults, who completed a visual categorization task with own- versus other-race faces. Participants were grouped into A/A homozygotes and G carriers and assigned a score to account for their type of child caregiver experience. A multivariate linear regression model was used to estimate the effect of genetic group, child caregiver experience, and their interaction on categorization reaction time. A significant interaction of genetic group and child caregiver experience (t = 2.48, p = 0.015), as well as main effects of both genetic group (t = −2.17, p = 0.033) and child caregiver experience (t = −4.29, p < 0.001) emerged. Post-hoc analysis revealed that the correlation between categorization reaction time and child caregiver experience was significantly different between the two genetic groups. A significant gene x environment interaction on face categorization appears to represent an indirect pathway through which genes and experiences interact to shape mature social sensitivity to faces in human adults.
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Affiliation(s)
- Michelle Jin Yee Neoh
- Psychology Program, School of Social Sciences, Nanyang Technological University, Singapore, Singapore
| | - Peipei Setoh
- Psychology Program, School of Social Sciences, Nanyang Technological University, Singapore, Singapore
| | - Andrea Bizzego
- Department of Psychology and Cognitive Science, University of Trento, Rovereto, Italy
| | - Moses Tandiono
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.,Human Genetics, Genome Institute of Singapore, Singapore, Singapore
| | - Jia Nee Foo
- Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.,Human Genetics, Genome Institute of Singapore, Singapore, Singapore
| | - Albert Lee
- Psychology Program, School of Social Sciences, Nanyang Technological University, Singapore, Singapore
| | - Marc H Bornstein
- Eunice Kennedy Shriver National Institute of Child Health and Human Development, Bethesda, MD, United States.,Institute for Fiscal Studies, London, United Kingdom.,UNICEF, New York, NY, United States
| | - Gianluca Esposito
- Department of Psychology and Cognitive Science, University of Trento, Rovereto, Italy
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Dalmaso M, Vicovaro M, Watanabe K. Cross-cultural evidence of a space-ethnicity association in face categorisation. CURRENT PSYCHOLOGY 2022. [DOI: 10.1007/s12144-022-02920-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
AbstractAccording to a space-valence association, individuals tend to relate negatively- and positively-connoted stimuli with the left and right side of space, respectively. So far, only a few studies have explored whether this phenomenon can also emerge for social dimensions associated with facial stimuli. Here, we adopted a cross-cultural approach and conducted two experiments with the main aim to test whether a left–right space-valence association can also emerge for other- vs. own-race faces. Asian Japanese (Experiment 1) and White Italian (Experiment 2) participants engaged in a speeded binary classification task in which a central placed face had to be classified as either Asian or White. Manual responses were provided through a left- vs. right-side button. In both experiments, other-race faces elicited faster responses than own-race faces, in line with the well-documented other-race categorisation advantage. Moreover, evidence of an association between space and ethnic membership also arose and, interestingly, was similar in both groups. Indeed, Asian faces were responded to faster with the right-side key than with the left-side key, whereas response side had no effect for White faces. These results are discussed with regard to possible cross-cultural differences in group perception.
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Ferera M, Pun A, Baron AS, Diesendruck G. The effect of familiarity on infants' social categorization capacity. PLoS One 2021; 16:e0247710. [PMID: 33661945 PMCID: PMC7932097 DOI: 10.1371/journal.pone.0247710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Accepted: 01/29/2021] [Indexed: 11/18/2022] Open
Abstract
Recent studies indicate that a preference for people from one’s own race emerges early in development. Arguably, one potential process contributing to such a bias has to do with the increased discriminability of own- vs. other-race faces–a process commonly attributed to perceptual narrowing of unfamiliar groups’ faces, and analogous to the conceptual homogenization of out-groups. The present studies addressed two implications of perceptual narrowing of other-race faces for infants’ social categorization capacity. In Experiment 1, White 11-month-olds’ (N = 81) looking time at a Black vs. White face was measured under three between-subjects conditions: a baseline “preference” (i.e., without familiarization), after familiarization to Black faces, or after familiarization to White faces. Compared to infants’ a priori looking preferences as revealed in the baseline condition, only when familiarized to Black faces did infants look longer at the "not-familiarized-category" face at test. According to the standard categorization paradigm used, such longer looking time at the novel (i.e., "not-familiarized-category") exemplar at test, indicated that categorization of the familiarized faces had ensued. This is consistent with the idea that prior to their first birthday, infants already tend to represent own-race faces as individuals and other-race faces as a category. If this is the case, then infants might also be less likely to form subordinate categories within other-race than own-race categories. In Experiment 2, infants (N = 34) distinguished between an arbitrary (shirt-color) based sub-categories only when shirt-wearers were White, but not when they were Black. These findings confirm that perceptual narrowing of other-race faces blurs distinctions among members of unfamiliar categories. Consequently, infants: a) readily categorize other-race faces as being of the same kind, and b) find it hard to distinguish between their sub-categories.
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Affiliation(s)
- Matar Ferera
- Department of Psychology, Bar-Ilan University, Ramat-Gan, Israel
- Gonda Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel
- * E-mail:
| | - Anthea Pun
- Department of Psychology, University of British Columbia, Vancouver, Canada
| | - Andrew Scott Baron
- Department of Psychology, University of British Columbia, Vancouver, Canada
| | - Gil Diesendruck
- Department of Psychology, Bar-Ilan University, Ramat-Gan, Israel
- Gonda Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel
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