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Almost no seminar, book, or YouTube tutorial on successful public speaking is without the established and traditional “cork exercise.” It is supposed to enhance speakers’ rhythm and intelligibility, for which there is, however, no scientific evidence so far. Our experiment addresses this gap. Twenty speakers performed a presentation task three times: (1) before a cork exercise intervention, (2) immediately after it, and (3) some minutes later after having completed a distractor questionnaire. The intervention was a video recorded by a professional media trainer. Results show significant rhythmic (and related melodic and articulatory) differences between presentations (1) and (2), suggesting a positive effect for speakers in (2). However, in presentation (3), all measurements revert to the baseline presentation (1) level. Thus, the "cork exercise" basically works and yields positive effects; however, they are short-lived. The chapter ends with suggestions for further research and practical ideas for a more sustainable design of the cork exercise.
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