Although research in the area of communication apprehension (CA) has been extensive, little of it has attempted to identify the regularity and intensity of the nonverbal stress behaviors associated with CA. Additionally, most CA research has concentrated on the problem in North American settings. To extend the boundaries of CA research, a study investigated CA interculturally, focusing on the identification, regularity, and intensity of nonverbal stress behaviors in speaking situations through the analysis of the self-perceptions of Japanese and North American subjects. These subjects, 284 North American and 256 Japanese college students ranging in age from 18 to 60, completed an instrument that asked them to assess their nonverbal behaviors in tense speaking situations. The results indicated more than 100 different forms of nonverbal behaviors ranging from rapid heart rate to trembling hands. Data concerning the frequency and intensity of the various forms of nonverbal behaviors were highly variable; however, the most frequently cited behaviors were similar for the two cultural groups, indicating the potential of a cross-cultural link in speaker self-perception of nonverbal behaviors. (Copies of the survey instruments and tables of data are appended.) (FL)