Speech Intelligibility in Severe Adductor Spasmodic Dysphonia This study compared speech intelligibility in nondisabled speakers and speakers with adductor spasmodic dysphonia (ADSD) before and after botulinum toxin (Botox) injection. Standard speech samples were obtained from 10 speakers diagnosed with severe ADSD prior to and 1 month following Botox injection, as well as from 10 age- and gender-matched ... Research Article
Research Article  |   February 01, 2004
Speech Intelligibility in Severe Adductor Spasmodic Dysphonia
 
Author Affiliations & Notes
  • Brenda K. Bender
    The University of Memphis, Memphis, TN
  • Michael P. Cannito
    The University of Memphis, Memphis, TN
  • Thomas Murry
    University of Pittsburgh, Pittsburgh, PA
  • Gayle E. Woodson
    University of Florida, Gainesville
  • Contact author: Brenda K. Bender, PhD, Communication Sciences and Disorders, Abilene Christian University, ACU Box 28058, Abilene, TX 79699. E-mail: brenda.bender@acu.edu
  • Currently affiliated with Abilene Christian University, Abilene, TX
    Currently affiliated with Abilene Christian University, Abilene, TX×
  • Currently affiliated with Columbia University, New York, NY
    Currently affiliated with Columbia University, New York, NY×
Article Information
Speech, Voice & Prosodic Disorders / Voice Disorders / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   February 01, 2004
Speech Intelligibility in Severe Adductor Spasmodic Dysphonia
Journal of Speech, Language, and Hearing Research, February 2004, Vol. 47, 21-32. doi:10.1044/1092-4388(2004/003)
History: Received February 13, 2003 , Accepted May 20, 2003
 
Journal of Speech, Language, and Hearing Research, February 2004, Vol. 47, 21-32. doi:10.1044/1092-4388(2004/003)
History: Received February 13, 2003; Accepted May 20, 2003
Web of Science® Times Cited: 6

This study compared speech intelligibility in nondisabled speakers and speakers with adductor spasmodic dysphonia (ADSD) before and after botulinum toxin (Botox) injection. Standard speech samples were obtained from 10 speakers diagnosed with severe ADSD prior to and 1 month following Botox injection, as well as from 10 age- and gender-matched healthy adults. This yielded 3 speaking conditions: pre-Botox injection, post-Botox injection, and normal control. Thirty phrases were extracted from the speech samples and arranged in a counterbalanced listening experiment. Thirty students, reporting little experience with distorted speech, served as listeners. Each listener's response was scored for words correctly identified using a liberal scoring criterion yielding a percentage of words correctly identified for each speaker. The results indicated that the speakers with ADSD were significantly more intelligible in the post-Botox condition than in the pre-Botox condition. The results also indicated that healthy speakers were significantly more intelligible than the speakers in both the preand post-Botox conditions. In general, these results indicated that intelligibility is affected in severe ADSD and that the use of Botox injection in ADSD improves intelligibility scores. However, the results also indicated that the use of Botox injection does not result in speech intelligibility similar to that of normal, non-ADSD speakers.

Acknowledgments
This research was supported in part by National Institutes of Health Grant 1 R15 DC 02299-01A1 ZRG1, M. P. Cannito, Principal Investigator. We would like to thank Joe Matesich for customizing the GLIDES software and providing computer support for this project.
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