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DOI : 10.1044/1092-4388

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Journal of Speech, Language, and Hearing Research 54, 4 (2011) 1067-1076

A critical evaluation of gestural stiffness estimations in speech production based on a linear second-order model

Susanne Fuchs 1, Pascal Perrier (  Auteur correspondant ) 2, Mariam Hartinger 1

PILIOS Project Collaboration(s)

(08/2011)

Purpose: Linear second-order models have often been used to investigate properties of speech production. However, these models are inaccurate approximations of the speech apparatus. This study aims at assessing how reliably stiffness can be estimated from kinematics with these models. Methods: Articulatory movements were collected for 9 speakers of German during the production of reiterant /CVCV/ words at varying speech rates. Velocity peaks, movement amplitudes and gesture durations were measured. In the context of an undamped model, two stiffness estimations were compared which should theoretically yield the same result. In the context of a damped model, gestural stiffness and damping were calculated for each gesture. Results: Numerous cases were found where stiffness estimations based on the undamped model contradicted each other. Less than 80% of the data were found to be compatible with the properties of the damped model. Stiffness tends to decrease with gestural duration. However, it is associated with a large, unrealistic damping dispersion, making stiffness estimations from kinematic data to a large extent unreliable. Conclusion: Any conclusions about speech control based on stiffness estimations using linear second-order models should therefore be considered with caution.

1 :	Zentrum für Allgemeine Sprachwisssenschaft (ZAS)
	Deutsche Forschungsgemeinschaft – Bundesministerium für Bildung und Forschung
2 :	Grenoble Images Parole Signal Automatique (GIPSA-lab)
	CNRS : UMR5216 – Université Joseph Fourier - Grenoble I – Université Pierre Mendès-France - Grenoble II – Université Stendhal - Grenoble III – Institut Polytechnique de Grenoble - Grenoble Institute of Technology

Équipe de recherche : MAGIC/GIPSA-lab; Phonetik/ZAS, Berlin, Germany

Domaine

:

Sciences cognitives/Linguistique Sciences cognitives/Psychologie Sciences de l'Homme et Société/Linguistique Sciences du Vivant/Neurosciences/Sciences cognitives

Mots Clés : Speech Production – Second Order Modell – Gestural Stiffness – Speech Motor Control

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Contributeur : Pascal Perrier <>

Soumis le : Mardi 30 Août 2011, 18:31:58

Dernière modification le : Lundi 12 Septembre 2011, 15:31:09