Formant Frequencies of Stuttered and Fluent Vowels The formant frequencies of 15 adult stutterers' fluent and disfluent vowels and the formant frequencies of stutterers' and nonstutterers' fluent vowels were compared in an F1-F2 vowel space and in a normalized F1-F2 vowel space. The results indicated that differences in formant frequencies observed between the stutterers' and nonstutterers' vowels ... Research Article
Research Article  |   September 01, 1987
Formant Frequencies of Stuttered and Fluent Vowels
 
Author Affiliations & Notes
  • Robert A. Prosek
    Walter Reed Army Medical Center, Washington, DC
  • Allen A. Montgomery
    Walter Reed Army Medical Center, Washington, DC
  • Brian E. Walden
    Walter Reed Army Medical Center, Washington, DC
  • David B. Hawkins
    Walter Reed Army Medical Center, Washington, DC
Article Information
Research Articles
Research Article   |   September 01, 1987
Formant Frequencies of Stuttered and Fluent Vowels
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 301-305. doi:10.1044/jshr.3003.301
History: Received July 7, 1986 , Accepted December 3, 1986
 
Journal of Speech, Language, and Hearing Research, September 1987, Vol. 30, 301-305. doi:10.1044/jshr.3003.301
History: Received July 7, 1986; Accepted December 3, 1986

The formant frequencies of 15 adult stutterers' fluent and disfluent vowels and the formant frequencies of stutterers' and nonstutterers' fluent vowels were compared in an F1-F2 vowel space and in a normalized F1-F2 vowel space. The results indicated that differences in formant frequencies observed between the stutterers' and nonstutterers' vowels can be accounted for by differences among the vocal tract dimensions of the talkers. In addition, no differences were found between the formant frequencies of the fluent and disfluent vowels produced by the stutterers. The overall pattern of these results indicates that, contrary to recent reports (Klich & May, 1982), stutterers do not exhibit significantly greater vowel centralization than nonstutterers.

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