Toward validation of an acoustic index of dysphonia severity

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Publication Type thesis
School or College College of Health
Department Communication Sciences & Disorders
Author Peterson, Elizabeth Anne
Title Toward validation of an acoustic index of dysphonia severity
Date 2012-08
Description This study investigated the relationship between a cepstral/spectral index of dysphonia severity (i.e., the CSID) and listener severity ratings of disordered voices. To assess the value of the CSID as a potential objective treatment outcomes tool, pre- and posttreatment samples of continuous speech and sustained vowel /a/ productions were elicited from 112 patients (with varying degrees of dysphonia) from six diagnostic categories: (1) unilateral vocal fold paralysis (UVFP), (2) adductor spasmodic dysphonia (ADSD), (3) primary muscle tension dysphonia (PMTD), (4) benign vocal fold lesions (BVFL), (5) presbylaryngis, and (6) mutational falsetto. Perceptual ratings of dysphonia severity in continuous speech were compared to acoustically-derived severity estimates using a three factor CSID model consisting of the cepstral peak prominence (CPP), the ratio of low-to-high spectral energy, and its standard deviation. A five factor CSID model incorporating all acoustic variables as well as gender and the CPP standard deviation was used to estimate severity in sustained vowel samples. Results showed strong relationships between perceptual and acoustic estimates in dysphonia severity in connected speech (r = 0.72, p < 0.0001) and sustained vowels (r = 0.836, p < 0.0001). A strong relationship between the perceived and predicted change in dysphonia severity from pre- to posttreatment was also observed for connected speech (r = 0.77, p < 0.001) and sustained vowels (r = 0.81, p < 0.0001). Spectrum effects were also examined, and overall severity (mild, moderate, or severe) did not influence the relationship between perceived and estimated severity ratings in connected speech (F[1, 2] = 0.58, p = 0.56); however, dysphonia severity did influence the relationship in sustained vowels (F[1, 2] = 6.22, p = 0.002). In general, the results confirm a robust relationship between listener perceived and acoustically-derived estimates of severity within the contexts of connected speech and sustained vowels across diverse diagnostic categories and varying degrees of dysphonia severity. As such, the CSID shows considerable promise an objective treatment outcomes measure.
Type Text
Publisher University of Utah
Subject Dysphonia; Speech-language pathology; Treatment outcomes measure; Voice
Dissertation Institution University of Utah
Dissertation Name Master of Science
Language eng
Rights Management Copyright © Elizabeth Anne Peterson 2012
Format Medium application/pdf
Format Extent 629,924 bytes
Identifier us-etd3/id/1099
ARK ark:/87278/s6611f2c
Setname ir_etd
Date Created 2012-06-13
Date Modified 2021-05-06
ID 194933
Reference URL
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