Speech Timing in Apraxia of Speech Versus Conduction Aphasia This study examined temporal parameters of speech in subjects with apraxia of speech, conduction aphasia, and normal speech. They were asked to repeat target words in a carrier phrase 10 times. Acoustic analyses involved measurement of stop gap duration, voice onset time, vowel nucleus duration, and consonant-vowel (CV) duration. Speakers ... Research Article
Research Article  |   June 01, 1996
Speech Timing in Apraxia of Speech Versus Conduction Aphasia
 
Author Affiliations & Notes
  • Samuel A. K. Seddoh
    Department of Speech Pathology & Audiology, The University of Iowa, Iowa City
  • Donald A. Robin
    Department of Speech Pathology & Audiology and National Center for Voice & Speech, The University of Iowa, Iowa City
  • Hyun-Sub Sim
    Department of Speech Pathology & Audiology and National Center for Voice & Speech, The University of Iowa, Iowa City
  • Carlin Hageman
    National Center for Voice & Speech, The University of Iowa, Iowa City and Department of Communicative Disorders, The University of Northern Iowa, Cedar Falls
  • Jerald B. Moon
    Department of Speech Pathology & Audiology and National Center for Voice & Speech, The University of Iowa, Iowa City
  • John W. Folkins
    Department of Speech Pathology & Audiology and National Center for Voice & Speech, The University of Iowa, Iowa City
  • Contact author: Donald A. Robin, PhD, Department of Speech Pathology and Audiology, Wendell Johnson Speech and Hearing Center, University of Iowa, 125 WJSHC, Iowa City, IA 52242–1012. E-mail: donald-robin@uiowa.edu
  • Editorial review coordinated by Arlene E. Carney
    Editorial review coordinated by Arlene E. Carney×
Article Information
Speech, Voice & Prosodic Disorders / Apraxia of Speech & Childhood Apraxia of Speech / Language Disorders / Aphasia / Speech / Research Articles
Research Article   |   June 01, 1996
Speech Timing in Apraxia of Speech Versus Conduction Aphasia
Journal of Speech, Language, and Hearing Research, June 1996, Vol. 39, 590-603. doi:10.1044/jshr.3903.590
History: Received February 8, 1995 , Accepted January 23, 1996
 
Journal of Speech, Language, and Hearing Research, June 1996, Vol. 39, 590-603. doi:10.1044/jshr.3903.590
History: Received February 8, 1995; Accepted January 23, 1996

This study examined temporal parameters of speech in subjects with apraxia of speech, conduction aphasia, and normal speech. They were asked to repeat target words in a carrier phrase 10 times. Acoustic analyses involved measurement of stop gap duration, voice onset time, vowel nucleus duration, and consonant-vowel (CV) duration. Speakers with apraxia of speech had longer and more variable stop gap, vowel, and CV durations than did subjects with aphasia or normal speech. Speakers with conduction aphasia had longer vowel durations and CV durations than subjects with normal speech. Also, subjects with apraxia of speech showed greater token-to-token variability than the other subject groups. The variability shown by subjects with apraxia of speech was significantly correlated with perceptual judgments of their speech. The significance of these results is discussed in the context of motoric and phonological explanations for apraxia of speech and conduction aphasia.

Acknowledgments
The research reported in this paper was supported by NIH (NIDCD) grant #DC90076 (NCVS) and by NIH (NINDS) grant #NS19632. Portions of this manuscript were presented at the 24th Clinical Aphasiology Conference in Traverse City, Michigan (June 1994). The token-to-token variability data from the subjects with apraxia have been presented in a different form with different analyses and for different theoretical reasons in Seddoh et al. (in press). We wish to thank the participants at the conference for their insightful questions, particularly Mick McNeil, Joe Duffy, Terry Wertz, Patrick Doyle, and Jay Rosenbek. We appreciate the excellent comments on an earlier version of the manuscript by two anonymous reviewers. We also appreciate the secretarial and logistic support of Mary Jo Yotty.
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