A Modeling Study of the Effects of Vocal Tract Movement Duration and Magnitude on the F2 Trajectory in CV Words Purpose This study used a computational vocal tract model to investigate the relationship of diphthong duration and vocal tract movement magnitude to measures of the F2 trajectory in CV words. Method Three words (bough, boy, and buy) were simulated on the basis of an adult female vocal tract ... Research Note
Research Note  |   December 01, 2016
A Modeling Study of the Effects of Vocal Tract Movement Duration and Magnitude on the F2 Trajectory in CV Words
 
Author Affiliations & Notes
  • Kimberly D. Neely
    University of Arizona, Tucson
  • Kate Bunton
    University of Arizona, Tucson
  • Brad H. Story
    University of Arizona, Tucson
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Brad H. Story: bstory@email.arizona.edu
  • Editor: Jody Kreiman
    Editor: Jody Kreiman×
  • Associate Editor: Julie Liss
    Associate Editor: Julie Liss×
Article Information
Speech, Voice & Prosody / Speech / Research Notes
Research Note   |   December 01, 2016
A Modeling Study of the Effects of Vocal Tract Movement Duration and Magnitude on the F2 Trajectory in CV Words
Journal of Speech, Language, and Hearing Research, December 2016, Vol. 59, 1327-1334. doi:10.1044/2016_JSLHR-S-14-0331
History: Received November 25, 2014 , Revised September 11, 2015 , Accepted February 19, 2016
 
Journal of Speech, Language, and Hearing Research, December 2016, Vol. 59, 1327-1334. doi:10.1044/2016_JSLHR-S-14-0331
History: Received November 25, 2014; Revised September 11, 2015; Accepted February 19, 2016

Purpose This study used a computational vocal tract model to investigate the relationship of diphthong duration and vocal tract movement magnitude to measures of the F2 trajectory in CV words.

Method Three words (bough, boy, and buy) were simulated on the basis of an adult female vocal tract model, in which the model parameters were estimated from audio recordings of a female talker. Model parameters were then modified to generate 35 simulations of each word corresponding to 7 different durations and 5 movement magnitude settings. In addition, these simulations were repeated with vocal tract lengths representative of an adult male and an approximately 6-year-old child.

Results On the basis of univariate analysis, measures of frequency predicted changes in magnitude, and temporal measures predicted changes in speaking rate consistent with the hypothesis. The combined effects of duration and magnitude showed that F2 was more sensitive to changes in magnitude at shorter word durations compared with longer word durations. This finding held across words and vocal tract length.

Conclusions Results suggest that there is an interaction between duration and magnitude that affects the slope of the F2 trajectory. The next step is to relate kinematics to F2 trajectory output using real speakers.

Acknowledgments
This work was supported by National Institutes of Health Grant R01-DC011275 (awarded to Brad H. Story) and National Science Foundation Grant BCS-1145011 (awarded to Brad H. Story and Kate Bunton). This was part of the first author's master's thesis.
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