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Journal of Speech, Language, and Hearing Research Vol.45 421-433 June 2002. doi:10.1044/1092-4388(2002/033)
© American Speech-Language-Hearing Association
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Direct Magnitude Estimates of Speech Intelligibility in Dysarthria

Effects of a Chosen Standard

Gary Weismer 1
Jacqueline S. Laures 2
1 Department of Communicative Disorders and Waisman Center University of Wisconsin-Madison
2 Program in Communication Disorders Georgia State University Atlanta

weismer{at}waisman.wisc.edu

Direct magnitude estimation (DME) has been used frequently as a perceptual scaling technique in studies of the speech intelligibility of persons with speech disorders. The technique is typically used with a standard, or reference stimulus, chosen as a good exemplar of "midrange" intelligibility. In several published studies, the standard has been chosen subjectively, usually on the basis of the expertise of the investigators. The current experiment demonstrates that a fixed set of sentence-level utterances, obtained from 4 individuals with dysarthria (2 with Parkinson disease, 2 with traumatic brain injury) as well as 3 neurologically normal speakers, is scaled differently depending on the identity of the standard. Four different standards were used in the main experiment, three of which were judged qualitatively in two independent evaluations to be good exemplars of midrange intelligibility. Acoustic analyses did not reveal obvious differences between these four standards but suggested that the standard with the worstscaled intelligibility had much poorer voice source characteristics compared to the other three standards. Results are discussed in terms of possible standardization of midrange intelligibility exemplars for DME experiments.

KEY WORDS: speech intelligibility, perceptual scaling, dysarthria

Submitted on June 26, 2001
Accepted on January 3, 2002




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