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American Journal of Speech-Language Pathology Vol.16 222-234 August 2007. doi:10.1044/1058-0360(2007/027)
© American Speech-Language-Hearing Association
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Research

Influence of Visual Information on the Intelligibility of Dysarthric Speech

Connie K. Keintz
Kate Bunton
Jeannette D. Hoit
University of Arizona, Tucson

Contact author: Connie Keintz, who is now at Florida Atlantic University, Department of Communication Sciences and Disorders, 777 Glades Road, P.O. Box 3091, Boca Raton, FL 33431. E-mail: ckeintz{at}fau.edu.

Purpose: To examine the influence of visual information on speech intelligibility for a group of speakers with dysarthria associated with Parkinson's disease.

Method: Eight speakers with Parkinson's disease and dysarthria were recorded while they read sentences. Speakers performed a concurrent manual task to facilitate typical speech production. Twenty listeners (10 experienced and 10 inexperienced) transcribed sentences while watching and listening to videotapes of the speakers (auditory-visual mode) and while only listening to the speakers (auditory-only mode).

Results: Significant main effects were found for both presentation mode and speaker. Auditory-visual scores were significantly higher than auditory-only scores for the 3 speakers with the lowest intelligibility scores. No significant difference was found between the 2 listener groups.

Conclusions: The findings suggest that clinicians should consider both auditory-visual and auditory-only intelligibility measures in speakers with Parkinson's disease to determine the most effective strategies aimed at evaluation and treatment of speech intelligibility decrements.

Key Words: Parkinson's disease, auditory-visual cues, speech perception, listener experience


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