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A small group of hand gestures made during conversation (interactive gestures) seem to function solely to assist the process of dialogue rather than to convey topical information. The rate of interactive gestures was significantly higher when 27 dyads talked in dialogue than in sequential monologues, whereas the rate of other (topical) gestures did not change; this difference supports the theory that interactive gestures are uniquely affected by the requirements of dialogue. A second, microanalytic study tested hypotheses about the specific functions of interactive gestures by examining the responses of the person to whom the gesture was addressed. Predictions were correct for 78 of 88 gestures sampled randomly from a large database. These results support the conclusion that interactive gestures are an important means by which speakers can include their addressees in the conversation. Moreover, these gestures demonstrate the importance of social (dialogic) processes in language use.
Bavelas et al. (Sat,) studied this question.