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An acoustic analysis of voiceless ob...

Nissen, Shawn L.

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An acoustic analysis of voiceless obstruents produced by adults and typically developing children.

Record Type:	Electronic resources : Monograph/item
Title/Author:	An acoustic analysis of voiceless obstruents produced by adults and typically developing children./
Author:	Nissen, Shawn L.
Description:	252 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 1880.
Contained By:	Dissertation Abstracts International65-01B.
Subject:	Health Sciences, Speech Pathology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3119485
ISBN:	9780496668762

An acoustic analysis of voiceless obstruents produced by adults and typically developing children.
Nissen, Shawn L.

An acoustic analysis of voiceless obstruents produced by adults and typically developing children. - 252 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 1880.

Thesis (Ph.D.)--The Ohio State University, 2003.

This item must not be sold to any third party vendors.

A considerable amount of speech research conducted over the last five decades has attempted to explain how the human perceptual system so accurately and efficiently perceives speech. Although scientists have made great strides toward understanding the mechanisms of speech production and perception, the complex relationships between the acoustic structures of speech and the resulting psychological percepts have yet to be fully and adequately explained. In particular, there is a limited amount of knowledge on the acoustic nature of speech produced by younger children. Thus, this study examined the acoustic structure of voiceless obstruents produced by adults and typically developing children from 3 to 6 years of age. Forty speakers from four different age groups produced word initial voiceless obstruents /p, t, k, f, theta, s, ∫/ in real word CV contexts, as well as a similar series of intervocalic obstruents drawn from non-words (VCV phonetic context). The acoustic structure of the speech tokens was described in terms of multiple acoustic parameters (durations, normalized amplitude, spectral peak location, spectral slope, and spectral moments). The results of this study indicated that multiple acoustic parameters of voiceless stops and fricatives vary systematically as a function of place of articulation, vowel context, speaker age, and gender. In particular, it was found that the spectral peak location, slope, and the first three spectral moments were able to distinguish between differing places of articulation. It was further shown that gender differences for several acoustic characteristics can be found in children at a relatively young age, with the acquired sibilant contrast between /s/ and /∫/ found to be less distinguished in children than adults. It was found that acoustic separation between the two sibilant fricatives widened as the age of the speakers increased, thereby suggesting that the contrast continues to be fine tuned throughout young childhood toward a more adult-like stage. Discriminant analysis revealed evidence that classification models based on adult male data were sensitive to gender related differences even in the youngest age group.

ISBN: 9780496668762Subjects--Topical Terms:

1018105
Health Sciences, Speech Pathology.

An acoustic analysis of voiceless obstruents produced by adults and typically developing children.
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245 1 3 $a An acoustic analysis of voiceless obstruents produced by adults and typically developing children.
300 $a 252 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 1880.
500 $a Adviser: Robert Allen Fox.
502 $a Thesis (Ph.D.)--The Ohio State University, 2003.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a A considerable amount of speech research conducted over the last five decades has attempted to explain how the human perceptual system so accurately and efficiently perceives speech. Although scientists have made great strides toward understanding the mechanisms of speech production and perception, the complex relationships between the acoustic structures of speech and the resulting psychological percepts have yet to be fully and adequately explained. In particular, there is a limited amount of knowledge on the acoustic nature of speech produced by younger children. Thus, this study examined the acoustic structure of voiceless obstruents produced by adults and typically developing children from 3 to 6 years of age. Forty speakers from four different age groups produced word initial voiceless obstruents /p, t, k, f, theta, s, ∫/ in real word CV contexts, as well as a similar series of intervocalic obstruents drawn from non-words (VCV phonetic context). The acoustic structure of the speech tokens was described in terms of multiple acoustic parameters (durations, normalized amplitude, spectral peak location, spectral slope, and spectral moments). The results of this study indicated that multiple acoustic parameters of voiceless stops and fricatives vary systematically as a function of place of articulation, vowel context, speaker age, and gender. In particular, it was found that the spectral peak location, slope, and the first three spectral moments were able to distinguish between differing places of articulation. It was further shown that gender differences for several acoustic characteristics can be found in children at a relatively young age, with the acquired sibilant contrast between /s/ and /∫/ found to be less distinguished in children than adults. It was found that acoustic separation between the two sibilant fricatives widened as the age of the speakers increased, thereby suggesting that the contrast continues to be fine tuned throughout young childhood toward a more adult-like stage. Discriminant analysis revealed evidence that classification models based on adult male data were sensitive to gender related differences even in the youngest age group.
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