Aided and Unaided Speech Supplementation Strategies Effect of Alphabet Cues and Iconic Hand Gestures on Dysarthric Speech Research Article
Research Article  |   October 01, 2005
Aided and Unaided Speech Supplementation Strategies
 
Author Affiliations & Notes
  • Katherine C. Hustad
    Waisman Center, University of Wisconsin—Madison
  • Jane Mertz Garcia
    Kansas State University, Manhattan
  • Corresponding author: e-mail: hustad@waisman.wisc.edu
Article Information
Speech, Voice & Prosodic Disorders / Dysarthria / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   October 01, 2005
Aided and Unaided Speech Supplementation Strategies
Journal of Speech, Language, and Hearing Research, October 2005, Vol. 48, 996-1012. doi:10.1044/1092-4388(2005/068)
History: Received June 18, 2004 , Revised December 10, 2004 , Accepted March 8, 2005
 
Journal of Speech, Language, and Hearing Research, October 2005, Vol. 48, 996-1012. doi:10.1044/1092-4388(2005/068)
History: Received June 18, 2004; Revised December 10, 2004; Accepted March 8, 2005
Web of Science® Times Cited: 13

Purpose: This study compared the influence of speaker-implemented iconic hand gestures and alphabet cues on speech intelligibility scores and strategy helpfulness ratings for 3 adults with cerebral palsy and dysarthria who differed from one another in their overall motor abilities.

Method: A total of 144 listeners (48 per speaker) orthographically transcribed sentences spoken with alphabet cues (aided), iconic hand gestures (unaided), and a habitual speech control condition; scores were compared within audio-visual and audio-only listening formats.

Results: When listeners were presented with simultaneous audio and visual information, both alphabet cues and hand gestures resulted in higher intelligibility scores and higher helpfulness ratings than the no-cues control condition for each of the 3 speakers. When listeners were presented with only the audio signal, alphabet cues and gestures again resulted in higher intelligibility scores than no cues for 2 of the 3 speakers. Temporal acoustic analyses showed that alphabet cues had consistent effects on speech production, including reduced speech rate, reduced articulation rate, and increased frequency and duration of pauses. Findings for gestures were less consistent, with marked differences noted among speakers.

Conclusions: Results illustrate that individual differences play an important role in the value of supplemental augmentative and alternative communication strategies and that aided and unaided strategies can have similar positive effects on the communication of speakers with global motor impairment.

Acknowledgments
Portions of this article were presented at the 2002 Conference on Motor Speech Disorders in Williamsburg, VA. We thank the speakers with dysarthria for participating in this research and Julie Auker for assisting with digital videotape postproduction.
This research was supported by a New Investigator grant from the American Speech-LanguageHearing Foundation and a grant from the National Institute on Deafness and Other Communication Disorders (R03 DC005536).
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