Assessing Vowel Centralization in Dysarthria: A Comparison of Methods

Autor/inn/en	Fletcher, Annalise R.; McAuliffe, Megan J.; Lansford, Kaitlin L.; Liss, Julie M.
Titel	Assessing Vowel Centralization in Dysarthria: A Comparison of Methods
Quelle	In: Journal of Speech, Language, and Hearing Research, 60 (2017) 2, S.341-354 (14 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1092-4388
DOI	10.1044/2016_JSLHR-S-15-0355
Schlagwörter	Articulation Impairments; Neurological Impairments; Vowels; Comparative Analysis; Evaluation Methods; Acoustics; Listening; Auditory Perception + Suchen Sie Ihr Suchwort? Artikulationsstörung; Neurodegenerative Erkrankung; Akustik; Hörvorgang; Zuhören; Auditive Wahrnehmung; Akustische Wahrnehmung
Abstract	Purpose: The strength of the relationship between vowel centralization measures and perceptual ratings of dysarthria severity has varied considerably across reports. This article evaluates methods of acoustic-perceptual analysis to determine whether procedural changes can strengthen the association between these measures. Method: Sixty-one speakers (17 healthy individuals and 44 speakers with dysarthria) read a standard passage. To obtain acoustic data, 2 points of formant extraction (midpoint and articulatory point) and 2 frequency measures (Hz and Bark) were trialed. Both vowel space area and an adapted formant centralization ratio were calculated using first and second formants of speakers' corner vowels. Twenty-eight listeners rated speech samples using different prompts: one with a focus on intelligibility, the other on speech precision. Results: Perceptually, listener ratings of speech precision provided the best index of acoustic change. Acoustically, the combined use of an articulatory-based formant extraction point, Bark frequency units, and the formant centralization ratio was most effective in explaining perceptual ratings. This combination of procedures resulted in an increase of 17% to 27% explained variance between measures. Conclusions: The procedures researchers use to assess articulatory impairment can significantly alter the strength of relationship between acoustic and perceptual measures. Procedures that maximize this relationship are recommended. (As Provided).
Anmerkungen	American Speech-Language-Hearing Association. 2200 Research Blvd #250, Rockville, MD 20850. Tel: 301-296-5700; Fax: 301-296-8580; e-mail: slhr@asha.org; Web site: http://jslhr.pubs.asha.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01