This field experiment investigated the effects of confronting people with different types and timings of descriptive feedback on their presentations of self. The experimental subjects were 28 male graduate students. The subjects made three-minute informal presentations on a personal topic and then received feedback on their individual performances. Feedback types and sequences were: (1) T.V. video-tape replay; (2) expert description, and then delayed T. V.; and (3) no immediate feedback (control) followed by delayed T. V. Semantic differential instruments, developed to assess the visual and vocal self, were administered before, during and one week after the experiment. The results indicate that: (1) immediate T. V. feedback had a stronger effect upon the structures of the self-percepts than did expert feedback or no feedback, but the differential effects were not always significant; (2) subjects in all three group-conditions first shifted significantly toward self-attitudes which were more favorable; (3) both types of change were greater for subjects with less speaking ability; and (4) the revised self-assessments were not altered further by any delayed T. V. feedback and were maintained over a follow-up period of one week. (Author)