The investigation of how social distance affects psychological phenomena has relied mostly on comparisons between strangers and acquaintances. Such an operationalization suffers from a confound between social distance and acquaintance. We propose an experimental paradigm that manipulates social distance while avoiding the aforementioned confound. By relying on reciprocity and known social tie formation mechanisms, the Interaction Game provides researchers with a powerful tool for the investigation of social distance effects without inducing negative affective or emotional states. Four preregistered experiments demonstrate the internal and external validity of the paradigm. The capability of manipulating social distance in a targeted manner constitutes a critical step towards advancing our knowledge of the impact of such metrics on human cognition and behavior.Moreover, Experiment 4 demonstrates that the Interaction Game can induce social distance that is free of acquaintanceship, and that such a minimal manipulation is sufficient for inducing close-other favoritism in a social discounting task. These findings expand our understanding of social distance as a powerful mechanism underlying social judgments and behaviors.
| INTRODUCTIONSocial distance is the structuring metric of the social world. It serves the purpose of distinguishing kin from unrelated others, friends from enemies, and ingroups from outgroups. Within these categories, social distance further separates siblings from other relatives, partners from peers, and acquaintances from strangers. As framed by Aron and colleagues (1992), "closeness has generally been understood as what distinguishes among relationship categories" (p. 596, Aron et al., 1992). More recently, social distance has been defined as "the perceived distance between individuals or groups" (Kazdin, 2000) highlighting its subjective nature, and as "the emotional proximity induced by the situation" (Charness & Gneezy, 2008) stressing its dynamics and context dependency. Social distance thereby fulfills our innate need to order the social world we live in by reducing complexity (Fiske, 1992). Its central position in shaping and navigating the social environment (Buss, 1990;Cosmides & Tooby, 1992) makes social distance a construct relevant to many different disciplines, from social psychology to evolutionary and cognitive psychology, and behavioral sciences like decision-making.