Vowel Acoustics in Dysarthria: Mapping to Perception

Autor/inn/en	Lansford, Kaitlin L.; Liss, Julie M.
Titel	Vowel Acoustics in Dysarthria: Mapping to Perception
Quelle	In: Journal of Speech, Language, and Hearing Research, 57 (2014) 1, S.68-80 (13 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1092-4388
DOI	10.1044/1092-4388(2013/12-0263)
Schlagwörter	Vowels; Acoustics; Articulation Impairments; Neurological Impairments; Comparative Analysis; Speech; Correlation; Multiple Regression Analysis; Discriminant Analysis; Auditory Perception + Suchen Sie Ihr Suchwort? Akustik; Artikulationsstörung; Neurodegenerative Erkrankung; Speaking; Sprechen; Korrelation; Diskriminanzanalyse; Auditive Wahrnehmung; Akustische Wahrnehmung
Abstract	Purpose: The aim of the present report was to explore whether vowel metrics, demonstrated to distinguish dysarthric and healthy speech in a companion article (Lansford & Liss, 2014), are able to predict human perceptual performance. Method: Vowel metrics derived from vowels embedded in phrases produced by 45 speakers with dysarthria were compared with orthographic transcriptions of these phrases collected from 120 healthy listeners. First, correlation and stepwise multiple regressions were conducted to identify acoustic metrics that had predictive value for perceptual measures. Next, discriminant function analysis misclassifications were compared with listeners' misperceptions to examine more directly the perceptual consequences of degraded vowel acoustics. Results: Several moderate correlative relationships were found between acoustic metrics and perceptual measures, with predictive models accounting for 18%-75% of the variance in measures of intelligibility and vowel accuracy. Results of the second analysis showed that listeners better identified acoustically distinctive vowel tokens. In addition, the level of agreement between misclassified-to-misperceived vowel tokens supports some specificity of degraded acoustic profiles on the resulting percept. Conclusion: Results provide evidence that degraded vowel acoustics have some effect on human perceptual performance, even in the presence of extravowel variables that naturally exert influence in phrase perception. (As Provided).
Anmerkungen	American Speech-Language-Hearing Association (ASHA). 10801 Rockville Pike, Rockville, MD 20852. Tel: 800-638-8255; Fax: 301-571-0457; e-mail: subscribe@asha.org; Web site: http://jslhr.asha.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2017/4/10