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ERIC Number: ED566008
Record Type: Non-Journal
Publication Date: 2013
Pages: 129
Abstractor: As Provided
Reference Count: N/A
ISBN: 978-1-3036-9759-3
Phonetic Effects on the Timing of Gestural Coordination in Modern Greek Consonant Clusters
Yip, Jonathan Chung-Kay
ProQuest LLC, Ph.D. Dissertation, University of Michigan
Theoretical approaches to the principles governing the coordination of speech gestures differ in their assessment of the contributions of biomechanical and perceptual pressures on this coordination. Perceptually-oriented accounts postulate that, for consonant-consonant (C1-C2) sequences, gestural timing patterns arise from speakers' sensitivity to the listener's need to perceptually recover the input, whereas biomechanically-oriented accounts focus on physical factors that might constrain the relevant articulators. This dissertation contributes to current understanding of gestural coordination by examining the influences of order of place of articulation (front-to-back, back-to-front), manner of C1 (plosive, fricative), and manner of C2 (plosive, fricative, lateral) on the timing of constrictions formed by the tongue tip, tongue dorsum, and lips. If speakers produce CC sequences in order to accommodate listeners' needs, temporal separation between C1 and C2 is expected in contexts in which acoustic masking due to intergestural overlap is especially likely. If speakers' productions are instead directed by physical limitations of the vocal tract, overlap should be reduced when the gestures for C1 and C2 are not independent. Specific instantiations of these broad hypotheses were tested in a production experiment in which eight Greek speakers' productions of initial CC sequences [pt ps pl ft kt ks kl xt] were imaged using ultrasound and video camera technologies. Degree of gestural overlap was measured in terms of temporal lag between the release of C1 constriction and the achievement of C2 constriction. Although perceptual-recoverability and biomechanical accounts made similar predictions for the effect of place order, they differed in their predictions for effects of C1 and C2 manner in the two place orders. Results showed that, consistent with biomechanics, dorsal-coronal [kt ks kl xt] were produced with greater intergestural lag than labial-coronal [pt ps pl ft]. Consistent with perceptual recoverability, plosive-plosive [pt kt] were produced with longer lag than fricative-plosive [ft xt]. An outcome not clearly predicted by either hypothesis was that lag was longer in [pt kt] than [ps ks]. Patterns, especially for plosive-lateral [pl kl], varied across speakers. These findings revealed an interplay between physical and perceptual--and potentially language-specific--demands on the timing of gestural coordination in speech production. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page:]
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Publication Type: Dissertations/Theses - Doctoral Dissertations
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A