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An acoustic item analysis of speech ...

Bunton, Kate Elizabeth.

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An acoustic item analysis of speech intelligibility.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	An acoustic item analysis of speech intelligibility./
作者:	Bunton, Kate Elizabeth.
面頁冊數:	341 p.
附註:	Source: Dissertation Abstracts International, Volume: 60-06, Section: B, page: 2649.
Contained By:	Dissertation Abstracts International60-06B.
標題:	Health Sciences, Speech Pathology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9917123
ISBN:	0599355468

An acoustic item analysis of speech intelligibility.
Bunton, Kate Elizabeth.

An acoustic item analysis of speech intelligibility. - 341 p.

Source: Dissertation Abstracts International, Volume: 60-06, Section: B, page: 2649.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 1999.

This study was designed to move beyond measures of intelligibility that provide severity estimates, and work toward an acoustic-perceptual understanding of impairments in speech intelligibility of dysarthric individuals. Phonetic error profiles for normal geriatric controls plus speakers in three disorder groups (ALS, PD, and CVA) were constructed based on the R. Kent, G. Weismer, J. Kent, and J. Rosenbek (1989) intelligibility test. The speakers within each group were diverse in several respects, including severity of dysarthria, duration of the disease, and medical history. These disorder groups were selected because previous research using phonetic error profiles has demonstrated there may be a relationship between disease type and phonetic error profile. Six contrasts were selected from the phonetic error profiles for acoustic analysis. Choices were based on the frequency of errors within and between the speaker groups as well as evidence from perceptual and acoustic studies relating to the basis of such errors. The six contrasts selected included high-low vowel, stop-nasal, stop-fricative, initial voiced-voiceless stop, glottal-null, and /r/-/w/ contrasts.

ISBN: 0599355468Subjects--Topical Terms:

1018105
Health Sciences, Speech Pathology.

An acoustic item analysis of speech intelligibility.
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500 $a Source: Dissertation Abstracts International, Volume: 60-06, Section: B, page: 2649.
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502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 1999.
520 $a This study was designed to move beyond measures of intelligibility that provide severity estimates, and work toward an acoustic-perceptual understanding of impairments in speech intelligibility of dysarthric individuals. Phonetic error profiles for normal geriatric controls plus speakers in three disorder groups (ALS, PD, and CVA) were constructed based on the R. Kent, G. Weismer, J. Kent, and J. Rosenbek (1989) intelligibility test. The speakers within each group were diverse in several respects, including severity of dysarthria, duration of the disease, and medical history. These disorder groups were selected because previous research using phonetic error profiles has demonstrated there may be a relationship between disease type and phonetic error profile. Six contrasts were selected from the phonetic error profiles for acoustic analysis. Choices were based on the frequency of errors within and between the speaker groups as well as evidence from perceptual and acoustic studies relating to the basis of such errors. The six contrasts selected included high-low vowel, stop-nasal, stop-fricative, initial voiced-voiceless stop, glottal-null, and /r/-/w/ contrasts.
520 $a Results of the study showed a discrepancy between the acoustic level of analysis and the contrast errors derived from the perceptual responses for the controls as well as disorder groups. Each phonetic contrast in the present study was thought to have a 'primary' acoustic measure or correlate which related to the listeners' response for that token. However, the acoustic characteristics of the error tokens did not move in the expected direction based on the phonetic contrast. In addition, ambiguous and conflicting information was found in the acoustic signal. These unexpected differences may have forced listeners to alter their perceptual strategies to arrive at a percept that matched a foil on the test. Further, because the acoustic measures used were based on research using 'normal' speakers, it is unclear whether they are reflective of the acoustic characteristics and perceptual correlates of each contrast for a dysarthric population. Overall, results show that there are no simple predictors of perceptual errors based on the acoustic characteristics for this population.
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