Article/Report  |   June 2002
Direct Magnitude Estimates of Speech Intelligibility in Dysarthria
Author Notes
Speech, Voice & Prosodic Disorders / Dysarthria / Speech
Article/Report   |   June 2002
Direct Magnitude Estimates of Speech Intelligibility in Dysarthria
Journal of Speech, Language, and Hearing Research June 2002, Vol.45, 421-433. doi:10.1044/1092-4388(2002/033)
History: Accepted 03 Jan 2002 , Received 26 Jun 2001
Journal of Speech, Language, and Hearing Research June 2002, Vol.45, 421-433. doi:10.1044/1092-4388(2002/033)
History: Accepted 03 Jan 2002 , Received 26 Jun 2001

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.

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