Thesis Title

The Effects of Auditory and Sematosensory Feedback on Speech Movements

Date of Graduation

Summer 2006

Degree

Master of Science in Communication Sciences and Disorders

Department

Communication Sciences and Disorders

Committee Chair

Ronald Netsell

Keywords

auditory feedback, somatosensory feedback, vowel undershoot, bite block, auditory masking

Subject Categories

Communication Sciences and Disorders

Abstract

Questions that address the neural mechanisms underlying speech production continue to drive research. Wallace (2003) investigated auditory and somatosensory feedback in productions of high-front [i]. In this study, the paradigm utilized by Wallace (2003) was replicated and extended to [i] and [] in the stimuli [bip], [gip], and [bp], and [gp]. Participants produced target stimuli under a control speaking condition and experiential conditions including auditory masking, small bite block, large bite block, and bite block and auditory masking combined. The difference between F1 and F2 (i.e., F2-F1) was measured at vowel onset and midvowel. Transition in F2 from vowel onset to midvowel (F2vo-F2mv) also was measured to investigate coarticulatory effects. It was hypothesized that altered sensory feedback would cause vowel undershoot in [bVp] and [gVp] productions. In addition, it was hypothesized the F2vo-F2mv would decreased in [gip] and [gp] due to tongue position of the initial consonant. Statistical analyses revealed vowel undershoot for [i], but not for []. Lack of significant results for [] was attributed to inherent variability in production of [] and reduced somatosensory feedback compared to [i] production. Coarticulatory effects were not significant for either vowel across conditions.

Copyright

© Marsha R. Howard

Citation-only

Open Access

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