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Journal of Speech and Hearing Research Vol.37 496-503 June 1994.
© American Speech-Language-Hearing Association
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Intelligibility and the Acoustic Characteristics of Speech in Amyotrophic Lateral Sclerosis (ALS)

Moira Mulligan 1
Joseph Carpenter 2
Joanne Riddel 3
Maureen Kenny Delaney 1
Gary Badger 2
Patricia Krusinski 4

Rup Tandan 4
1 Center for Disorders of Communication Medical Center Hospital of Vermont Burlington
2 Department of Medical Biostatistics University of Vermont Burlington
3 Department of Communication Science and Disorders University of Vermont Burlington
4 Department of Neurology University of Vermont Burlington

The purpose of this study was to analyze the changes in specific speech parameters in 14 patients, 7 dysarthric and 7 non-dysarthric, with amyotrophic lateral sclerosis (ALS), over a 6-month period. Measurements of single word intelligibility, F2 formant trajectories (extent, duration and rate) and diadochokinetic rate showed decreased performance in dysarthric patients as compared to non-dysarthric patients at baseline. F2 transition rates of less than 4 Hz/msec were seen only in dysarthric ALS patients. A relationship between the F2 transition rate and single word intelligibility was noted for patients with moderate to high intelligibility, but at lower levels of intelligibility the F2 rate reached a plateau despite continued decline in intelligibility. Our results support the need for frequent evaluation of dysarthric ALS patients to better understand the relationship between intelligibility and the acoustic parameters of speech.

KEY WORDS: amyotrophic lateral sclerosis (ALS), dysarthria, acoustic analysis, Intelligibility

Submitted on October 25, 1992
Accepted on October 15, 1993


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