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Maintaining social cohesion in times of increasing diversity is a major challenge of modern societies. Mitigating defaults in group-based trust could be a solution because they are often driven by stereotypes and ingroup favoritism. Ingroup diversity could be a means to achieve such a mitigation given that it increases cognitive flexibility and cognitive flexibility changes defaults in trust – in the sense of increasing low and reducing high trust. We tested whether representing one’s ingroup as high (compared to low) in diversity mitigates defaults in group-based trust using a variety of well-established manipulations of ingroup diversity and measures of trust. None of the four well-powered studies (total N = 885), we conducted provided support for our hypothesis. However, an internal meta-analysis revealed a significant but very small effect in support of our prediction (r = 0.07, 95% CI [0.01, 0.14]). Thus, a diverse representation of the ingroup asserts a mitigating impact on group-based trust, but the size of the effect is very small. Thus, real world interventions should not rely on the current effect. Keywords: outgroup trust, ingroup diversity, cognitive flexibility, stereotypes, ingroup favoritism How to Cite: Winter, K., & Sassenberg, K. (2021). Mitigating the Default? The Influence of Ingroup Diversity on Outgroup Trust. International Review of Social Psychology, 34(1), 19. DOI: http://doi.org/10.5334/irsp.520 Handling Editor: Aïna Chalabaev Université Grenoble Alpes, FR Contact: iD X close 229 Views 72 Downloads 8 Twitter   Published on 04 Aug 2021 Peer Reviewed  CC BY 4.0  Accepted on 05 Jul 2021            Submitted on 15 Oct 2020 In modern societies, people are confronted with members of numerous other social groups – being it based on ethnicity, religion, education level, political ideology, or other social categories. In a diverse environment like this, trust in outgroups and their members is one of the central components of a peaceful and cooperative coexistence, because distrust can fuel intergroup polarization and conflicts (Esteban & Schneider, 2008). However, in general people trust ingroup members more than members of outgroups; and trust in many outgroups is a priori low (Foddy et al., 2009). Thus, it is important to understand how the low trust in outgroups – which seems to be the default in many cases – can be mitigated.

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