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The purposes of this study were to provide a more stringent test of the effects of video feedback on public speaking anxiety and to examine the possibility that the video feedback might be more effective for some individuals than for others, as well as the mechanism of change involved. Half of 60 speech-anxious undergraduates were randomly assigned to video feedback with cognitive preparation group, and the other half were assigned to the comparison group who engaged in neutral imagery task and watched a video with neutral scene. Participants in the video feedback group made lower ratings of their behavioral and somatic response aspects of public speaking anxiety following video feedback than those in the comparison, and this effect generalized to a second speech. Video feedback tended to have transient effect on self-perception of performance. On the other hand, any differences between the two groups on subjective ratings of neither anxiety nor overall performance were significant. The level of depression at pre-experiment significantly moderated the relationship between video feedback and pre- to post-treatment change in self-perception of performance. Changes in estimated probability of anxiety appearance were a ful mediator of treatment change following video feedback as measured on ratings of behavioral and somatic response aspects of public speaking anxiety. Finally, clinical and theoretical implications as well as limitations of this study were discussed.
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