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Abstract

This study examines how mediated instruction affects public speaking anxiety (PSA), self-efficacy, and motivation. Grounded in social cognitive and multimedia learning theories, 137 students viewed or listened to a brief lecture on PSA control. Results showed significant improvements in self-efficacy, reduced PSA, and increased motivation, with no significant differences between audio-only and audio-video formats. These findings suggest that audio-only instruction can be as effective as video-based content, offering an accessible alternative for diverse learners. The study highlights the value of brief, mediated interventions for improving public speaking outcomes in both traditional and online learning environments.

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