Journal of Speech, Language, and Hearing Research Vol.53 61-74 February 2010. doi:10.1044/1092-4388(2009/08-0017)
© American Speech-Language-Hearing Association
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Articles

Vowel Acoustics in Adults With Apraxia of Speech

Adam Jacks
Katey A. Mathes
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{at}gmail.com.

Purpose: To 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.

Method: Seven 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.

Results: Measures 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.

Conclusion: Comparison 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.

KEY WORDS: apraxia of speech, acquired, acoustic, vowel, aphasia


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