Synchronized behavior increases assessments of the formidability and cohesion of coalitions

Abstract

Synchronized behavior is a common feature of martial drills and military parades in many societies. Hagen and colleagues Hagen & Hammerstein, 2009) hypothesized that the intentional enactment of synchronized behavior evolved as a means of signaling coalitional strength, as individuals who can synchronize are able to act in concert in agonistic contexts. Previous research has explored either the subjective consequences of synchrony for participants in synchronized behaviors or the effect of synchrony on observers' impressions of rapport among the synchronized actors. Critically, left untested is the central tenet that, by communicating that the individuals constitute a coordinated unit, synchronized behaviors signal elevated fighting capacity. We tested this prediction in two studies by asking large U.S. samples to judge the envisioned physical formidability -previously demonstrated to summarize assessments of diverse determinants of fighting capacity -of U.S. soldiers or terrorists on the basis of audio tracks of either synchronous or asynchronous footsteps.Consonant with the agonistic signaling hypothesis, participants judged the synchronized target individuals to be larger and more muscular than the unsynchronized individuals, an effect mediated by their assessment that the former collectively constitute a single unified entity.Although synchronized footsteps also enhanced listeners' perceptions of social bonding among the target individuals, this assessment did not mediate their judgments of elevated formidability, suggesting that synchrony primarily signals fighting capacity via revealed entitativity rather than inferred motivation.Keywords: synchrony; signaling; fighting capacity; entitativity; perceived coalitional quality 2 1.0 Introduction 1.1 Synchronized behavior: theory and prior research. Across widely diverse cultures, and among societies of very different scales, synchronized behavior is a prominent feature of rituals and collective displays. Over the last two decades a growing literature has explored the psychological effects of synchronized movement and synchronized sound production (reviewed in Keller et al., 2014). At an elementary level, the effects of synchrony can be dichotomized into two classes, namely the impact that synchrony has on participants in such activities, and the impact that it has on observers. In a seminal book, McNeill (1995) proposed that synchronized movement enhances social bonding among participants, and that, over the course of human history, this process has played a pivotal role in the rise of cooperation.Pushing the roots of synchrony even farther back in time, Hagen and colleagues Hagen & Hammerstein, 2009) argued that music and dance derive from phylogenetically ancient coordinated territorial defense signals; in humans, these signals were refined to communicate the size, cohesiveness, and capabilities of coalitions, as intentionally enacted synchronized behavior inherently requires both the ability and the motivation to effectively coordinate actions. In b...

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