This study investigated the effects of delayed auditory feedback (DAF) on speech kinematics during tongue twisters and monologues. Participants were 20 adults (10 men, 10 women) aged 18-29 with typical speech and hearing abilities. A smartphone app provided DAF latencies of 50 ms, 100 ms, and 150 ms. Kinematic measures were made of peak speed, stroke distance, and hull area for the tongue front, jaw, and lower lip under typical and the three DAF conditions. Results indicated that DAF significantly reduced peak speed and stroke distance for all articulators during tongue twisters (p < .01), with the effect magnitude increasing with longer delays. No significant DAF effects were observed in monologues (p > .05). Sex differences were noted, with women showing higher speeds and longer stroke distances across both tasks (p < .05). These findings suggest that DAF disrupts motor performance, particularly in structured tasks, and that sex differences are present in speech kinematics. Future research could explore the perceptual impacts of DAF and the cognitive load associated with speech under altered feedback conditions.
| Identifer | oai:union.ndltd.org:BGMYU2/oai:scholarsarchive.byu.edu:etd-11483 |
| Date | 25 July 2024 |
| Creators | Persons, Abbey Corinne |
| Publisher | BYU ScholarsArchive |
| Source Sets | Brigham Young University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Theses and Dissertations |
| Rights | https://lib.byu.edu/about/copyright/ |
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