Velocity Profiles of Lip Protrusion Across Changes in Speaking Rate The effects of speaking rate manipulation were examined in the velocity profiles of anticipatory lip protrusion gestures. Systematic changes in the shape, symmetry, and smoothness of the velocity profiles were observed as speaking rate was modulated across a wide range of self-selected rates, from fast to slow. Velocity profiles of ... Research Article
Research Article  |   February 01, 1997
Velocity Profiles of Lip Protrusion Across Changes in Speaking Rate
 
Author Affiliations & Notes
  • Susan Shaiman
    Department of Speech-Language Pathology University of Toronto and The Toronto Hospital Toronto, Ontario, Canada
  • Scott G. Adams
    Department of Communicative Disorders University of Western Ontario London, Ontario, Canada
  • Mikael D. Z. Kimelman
    Department of Speech-Language Pathology University of Toronto and The Toronto Hospital Toronto, Ontario, Canada
  • Corresponding author: e-mail: shaiman@csd.upmc.edu
  • Currently affiliated with the University of Pittsburgh, Pittsburgh, PA
    Currently affiliated with the University of Pittsburgh, Pittsburgh, PA×
  • Currently affiliated with Duquesne University, Pittsburgh, PA
    Currently affiliated with Duquesne University, Pittsburgh, PA×
Article Information
Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   February 01, 1997
Velocity Profiles of Lip Protrusion Across Changes in Speaking Rate
Journal of Speech, Language, and Hearing Research, February 1997, Vol. 40, 144-158. doi:10.1044/jslhr.4001.144
History: Received December 15, 1995 , Accepted October 10, 1996
 
Journal of Speech, Language, and Hearing Research, February 1997, Vol. 40, 144-158. doi:10.1044/jslhr.4001.144
History: Received December 15, 1995; Accepted October 10, 1996

The effects of speaking rate manipulation were examined in the velocity profiles of anticipatory lip protrusion gestures. Systematic changes in the shape, symmetry, and smoothness of the velocity profiles were observed as speaking rate was modulated across a wide range of self-selected rates, from fast to slow. Velocity profiles of movements produced at slower than normal speaking rates demonstrated greater asymmetry, irregularity, and differences in geometric form, compared to normal and faster-than-normal rates. Subjects evidenced both inter- and intrasubject variability in the accomplishment of lip protrusion and rate manipulations. These results indicate that the velocity profiles of lip protrusion gestures do not necessarily remain invariant across changes in speaking rate. Rather, the data suggest that distinct movement patterns may be generated for slow speaking rates, with select characteristics of the movement pattern being maintained across normal and fast speaking rates.

Acknowledgments
This research was supported by a grant to the first author from the Natural Sciences and Engineering Research Council of Canada. The authors wish to thank Meagan Ward, Anna Pittiglio, Sophie Lafaille, and Reinhard Schuller for their assistance with various aspects of this study. We also express our appreciation to Drs. Katherine Harris, Michael McClean, and Pascal Perrier for their helpful comments and suggestions.
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