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Assessing Vowel Centralization in Dysarthria

Title: Assessing Vowel Centralization in Dysarthria: A Comparison of Methods.
Name(s): Fletcher, Annalise R, author
McAuliffe, Megan J, author
Lansford, Kaitlin L, author
Liss, Julie M, author
Type of Resource: text
Genre: Journal Article
Date Issued: 2017-02-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: 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. 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. 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. 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.
Identifier: FSU_pmch_28124069 (IID), 10.1044/2016_JSLHR-S-15-0355 (DOI), PMC6194930 (PMCID), 28124069 (RID), 28124069 (EID), 2599995 (PII)
Grant Number: R01 DC006859
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at
Subject(s): Adult
Aged, 80 and over
Middle Aged
Reproducibility of Results
Sound Spectrography
Speech Acoustics
Speech Intelligibility
Speech Production Measurement/methods
Persistent Link to This Record:
Host Institution: FSU
Is Part Of: Journal of speech, language, and hearing research : JSLHR.
Issue: iss. 2, vol. 60

Choose the citation style.
Fletcher, A. R., McAuliffe, M. J., Lansford, K. L., & Liss, J. M. (2017). Assessing Vowel Centralization in Dysarthria: A Comparison of Methods. Journal Of Speech, Language, And Hearing Research : Jslhr. Retrieved from