ABSTRACT
A profound but not much studied aspect of social behavior is the ability to coordinate movements in between-person interactions. A striking property of natural interactions is the degree of coordination or what has been called interactional synchrony. Coordination in interactions is not just one person’s reacting to another in an S-R fashion but a mutual interaction such that the two individuals act like a single “organism” (Asch, 1952) or a dyadic synergy (Schmidt, Carello, & Turvey, 1990). The degree of explicitness of the mutual task at hand can be used to differentiate between two lines of research that have been established for investigating between-person coordination.
