Body sway predicts romantic interest in speed dating

Abstract

Speed dating research paradigms offer both high external validity and experimental control for studying romantic interest, an essential form of social bonding. While previous studies focused on the effect of social and personality factors on romantic interest, the present study investigated whether romantic interest can be (1) predicted by dyadic interactive body sway, and (2) be further promoted by groovy background music. Participants’ body sway trajectories were recorded during speed dating. Directional (communicative) body sway coupling, but not body sway similarity, predicted interest in a long-term relationship above and beyond rated physical attractiveness. In addition, groovy music promoted interest in meeting a dating partner again. Overall, we demonstrate that real-world romantic interest can be revealed by body sway interaction, potentially reflecting the quality of communication and perceived compatibility, and can be promoted by groovy music.