Thecurrent monographasserts that nonverbal behaviorscan serveas usefulovert indices of experienced arousal. Various conceptualizutions of arousal and factors eliciting arousnl in communication situations are examined. It is proposed that, from a communicntion standpoint, indices of arousal and arousal change are best classijied along two dimensions of arousal intensity and arousal valence. Diverse bodies of literature on nonverbal coiicornitaii ts ojarousnlare reviewed. As afirst test ofwhether separate profiles exist for negatively, as opposed to positively or neutrally, valenced arousal, data are analyzed from a mock-interview experiment in which, following a baseline interview, participants (N=52) were subjected by an interviewer to either increased or decreased involvement. 717e involvement changes were expected to elevate arousal intensity for all participants nnd induce positively or negatively valenced arousal in the two respective conditions. Polynomial regressions and z-test comparisons of correlations revealed that 16 composites, comprising a total of47 nonverbal vnriables, showed significant associations with clinnges in arousal.