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Journal of Speech and Hearing Research Vol.39 590-603 June 1996.
© American Speech-Language-Hearing Association
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Speech Timing in Apraxia of Speech Versus Conduction Aphasia

Samuel A. K. Seddoh 1
Donald A. Robin 2
Hyun-Sub Sim 2
Carlin Hageman 3
Jerald B. Moon 4

John W. Folkins 4
1 Department of Speech Pathology & Audiology The University of Iowa Iowa City
2 Department of Speech Pathology & Audiology and National Center for Voice & Speech The University of Iowa Iowa City
3 National Center for Voice & Speech The University of Iowa Iowa City and Department of Communicative Disorders The University of Northern Iowa Cedar Falls
4 Department of Speech Pathology & Audiology and National Center for Voice & Speech University of Iowa Iowa City

donald-robin{at}uiowa.edu

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.

Note:

Editorial review coordinated by Arlene E. Carney

KEY WORDS: apraxia, aphasia, temporal coordination, speech variability

Submitted on February 8, 1995
Accepted on January 23, 1996






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