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Prosem Lecture: Does Schwa Have an Auditory Target? An Altered Auditory Feedback Study
April 29 @ 12:00 pm - 1:00 pm
Presenter: Sarah Bakst, Ph.D., Postdoctoral Research Associate, Communication Sciences & Disorders, University of Wisconsin – Madison
Topic: Does Schwa Have an Auditory Target? An Altered Auditory Feedback Study
Schwa is cross-linguistically described as having a variable target (e.g. Koopmans-van Beinum 1994). The present study examines whether speakers are sensitive to auditory feedback when producing schwa. When speakers hear themselves producing a version of their speech where formants have been altered, they will change their motor plans on-line so that their altered feedback is a better match to the target (e.g. Houde & Jordan 1998). If schwa has no target, then feedback mismatches may not drive a change in production
In this experiment, participants spoke disyllabic iambs and trochees where the auditory feedback of F1 was raised by 100 mels. Both stressed and unstressed syllables showed compensatory decreases in F1, with greater levels of adaptation in schwa than stressed vowels. However, across different vowels, the magnitude of adaptation in schwa was highly dependent on that of the heterosyllabic vowel, consistent with the idea that schwa is highly assimilatory
Work supported by NIH T32 5T32DC005359-13 (grant to Carrie Niziolek