Respiratory Control in Stuttering Speakers Evidence From Respiratory High-Frequency Oscillations Research Article
Research Article  |   August 01, 2000
Respiratory Control in Stuttering Speakers
 
Author Affiliations & Notes
  • Margaret Denny
    Boston University Boston, MA
  • Anne Smith
    Purdue University West Lafayette, IN
  • Corresponding author: e-mail: mdenny@bu.edu
Article Information
Speech, Voice & Prosodic Disorders / Fluency Disorders / Speech / Research Articles
Research Article   |   August 01, 2000
Respiratory Control in Stuttering Speakers
Journal of Speech, Language, and Hearing Research, August 2000, Vol. 43, 1024-1037. doi:10.1044/jslhr.4304.1024
History: Received May 24, 1999 , Accepted January 31, 2000
 
Journal of Speech, Language, and Hearing Research, August 2000, Vol. 43, 1024-1037. doi:10.1044/jslhr.4304.1024
History: Received May 24, 1999; Accepted January 31, 2000

This study tested the hypothesis that, in stuttering speakers, relations between the neural control systems for speech and life support, or metabolic breathing, may differ from relations previously observed in normally fluent subjects. Bilaterally coherent high-frequency oscillations in inspiratory-related EMGs, measured as maximum coherence in the frequency band of 60–110 Hz (MC-HFO), were used as indicators of participation by the brainstem controller for metabolic breathing in 10 normally fluent and 10 stuttering speakers. In all controls and most stuttering subjects, MC-HFO for speech was higher than or comparable to MC-HFO for deep breathing. For 4 stuttering subjects, higher MC-HFO was observed for speech than for deep breathing. Comparison of deep breathing to a speechlike breathing task yielded similar results. No relationship between MC-HFO during speech and severity of disfluency was observed. We conclude that in some stuttering speakers, the relations between respiratory controllers are atypical, but that high participation by the HFO-producing circuitry in the brainstem during speech is not sufficient to disrupt fluency.

Acknowledgments
We wish to thank Susan McGarvey for her help in rating the fluency of the stuttering subjects' speech. This work was partially supported by a grant from NIH’s National Institute on Deafness and Other Communication Disorders, DC00559.
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