Vowel Acoustics in Adults With Apraxia of Speech PurposeTo investigate the hypothesis that vowel production is more variable in adults with acquired apraxia of speech (AOS) relative to healthy individuals with unimpaired speech. Vowel formant frequency measures were selected as the specific target of focus.MethodSeven adults with AOS and aphasia produced 15 repetitions of 6 American English vowels ... Article
Article  |   February 01, 2010
Vowel Acoustics in Adults With Apraxia of Speech
 
Author Affiliations & Notes
  • Adam Jacks
    The University of Texas at Austin
  • Katey A. Mathes
    The University of Texas at Austin
  • Thomas P. Marquardt
    The University of Texas at Austin
  • Contact author: Adam Jacks, Division of Speech and Hearing Sciences, Department of Allied Health Sciences, The University of North Carolina at Chapel Hill, 3105 Bondurant Hall, Campus Mail 7190, Chapel Hill, NC 27599-7190. E-mail: adamjacks@gmail.com.
Article Information
Speech, Voice & Prosodic Disorders / Apraxia of Speech & Childhood Apraxia of Speech / Speech, Voice & Prosody / Speech
Article   |   February 01, 2010
Vowel Acoustics in Adults With Apraxia of Speech
Journal of Speech, Language, and Hearing Research, February 2010, Vol. 53, 61-74. doi:10.1044/1092-4388(2009/08-0017)
History: Received January 21, 2008 , Revised October 27, 2008 , Accepted May 14, 2009
 
Journal of Speech, Language, and Hearing Research, February 2010, Vol. 53, 61-74. doi:10.1044/1092-4388(2009/08-0017)
History: Received January 21, 2008; Revised October 27, 2008; Accepted May 14, 2009
Web of Science® Times Cited: 6

PurposeTo investigate the hypothesis that vowel production is more variable in adults with acquired apraxia of speech (AOS) relative to healthy individuals with unimpaired speech. Vowel formant frequency measures were selected as the specific target of focus.

MethodSeven adults with AOS and aphasia produced 15 repetitions of 6 American English vowels in /hVC/ context (hid,head,hat,hot,hub,hoot). Vowel formant frequency measures (F1, F2) were Bark transformed and compared with data from archival sources.

ResultsMeasures of vowel acoustics in speakers with AOS did not differ from those of unimpaired speakers, including absolute Bark formant values, vowel space area, intervowel distance, and individual trial-to-trial formant variability.

ConclusionComparison with normative acoustic measures suggested that vowel production at the word level is unimpaired in the current speakers with AOS, supporting previous studies that have shown vowel production is relatively intact in AOS.

Acknowledgments
This research represents an extension of a master of arts thesis by the second author at The University of Texas at Austin, Department of Communication Sciences and Disorders. Rachel Olivarez (Department of Communication Disorders, Texas State University–San Marcos) assisted in the preparation of the article. We gratefully acknowledge the individuals with apraxia of speech who participated in this study.
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