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An investigation of articulatory-aco...

Nieto-Castanon, Alfonso.

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An investigation of articulatory-acoustic relationships in speech production.

Record Type:	Electronic resources : Monograph/item
Title/Author:	An investigation of articulatory-acoustic relationships in speech production./
Author:	Nieto-Castanon, Alfonso.
Description:	114 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2278.
Contained By:	Dissertation Abstracts International65-05B.
Subject:	Biology, Neuroscience. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3132778
ISBN:	0496800183

An investigation of articulatory-acoustic relationships in speech production.
Nieto-Castanon, Alfonso.

An investigation of articulatory-acoustic relationships in speech production. - 114 p.

Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2278.

Thesis (Ph.D.)--Boston University, 2004.

This thesis is a combination of empirical and modeling work concerning articulatory-acoustic relationships in speech production. The empirical work investigates the functional relationship between articulatory variability and stability of acoustic cues during American English /r/ production. The analysis of articulatory movements shows that the extent of intra-subject articulatory variability along any given articulatory direction is strongly and inversely related to a measure of acoustic stability (the extent of acoustic variation that displacing the articulators in this direction would produce). The presence and direction of this relationship is consistent with a speech motor control mechanism that uses a third formant frequency target for /r/. Simulations of two speakers' /r/ productions, using the DNA model of speech production in conjunction with novel speaker-specific vocal tract models derived from magnetic resonance imaging data, mimic the observed range of articulatory gestures each subject used in different phonetic contexts, while exhibiting the same articulatory/acoustic relations as those observed in the experimental data. Overall these results indicate that the production target for American English /r/ is acoustic in nature, rather than articulatory.

ISBN: 0496800183Subjects--Topical Terms:

1017680
Biology, Neuroscience.

An investigation of articulatory-acoustic relationships in speech production.
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100 1 $a Nieto-Castanon, Alfonso. $3 1908441
245 1 3 $a An investigation of articulatory-acoustic relationships in speech production.
300 $a 114 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2278.
500 $a Major Professor: Frank H. Guenther.
502 $a Thesis (Ph.D.)--Boston University, 2004.
520 $a This thesis is a combination of empirical and modeling work concerning articulatory-acoustic relationships in speech production. The empirical work investigates the functional relationship between articulatory variability and stability of acoustic cues during American English /r/ production. The analysis of articulatory movements shows that the extent of intra-subject articulatory variability along any given articulatory direction is strongly and inversely related to a measure of acoustic stability (the extent of acoustic variation that displacing the articulators in this direction would produce). The presence and direction of this relationship is consistent with a speech motor control mechanism that uses a third formant frequency target for /r/. Simulations of two speakers' /r/ productions, using the DNA model of speech production in conjunction with novel speaker-specific vocal tract models derived from magnetic resonance imaging data, mimic the observed range of articulatory gestures each subject used in different phonetic contexts, while exhibiting the same articulatory/acoustic relations as those observed in the experimental data. Overall these results indicate that the production target for American English /r/ is acoustic in nature, rather than articulatory.
520 $a Current models of speech production that use acoustic targets drastically simplify the nature and dimensionality of acoustic descriptors in order to facilitate efficient and robust control of the speech apparatus. These simplifications are not in accordance with neurophysiological and imaging evidence on the cortical representation of sounds. The modeling section of this thesis proposes a solution to the speech production control problem that uses a cortical representation of the sound that fits the multifaceted representations found in auditory cortex. A mathematical approximation to the relationship between articulatory movements and the associated changes in the sound spectrum leads to the definition of a novel difference measure for comparing two sound spectra. This measure is closely related to the articulatory movements necessary to transform one sound into the other. A neural model for the cortical representation of sounds is then developed to implement the basic computations leading to estimation of the proposed difference measure. Simulations of this neural model demonstrate successful inverse control strategies for speech production based on acoustic targets.
590 $a School code: 0017.
650 4 $a Biology, Neuroscience. $3 1017680
650 4 $a Health Sciences, Speech Pathology. $3 1018105
690 $a 0317
690 $a 0460
710 2 0 $a Boston University. $3 1017454
773 0 $t Dissertation Abstracts International $g 65-05B.
790 1 0 $a Guenther, Frank H., $e advisor
790 $a 0017
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3132778