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A Bayesian framework for speech motor control

Abstract : The remarkable capacity of the speech motor system to adapt to various speech conditions is due to an excess of degrees of freedom, which enables producing similar acoustical properties with different sets of control strategies. To explain how the Central Nervous System selects one of the possible strategies, a common approach, in line with optimal motor control theories, is to model speech motor planning as the solution of an optimality problem based on cost functions. Despite the success of this approach, one of its drawbacks is the intrinsic contradiction between the concept of optimality and the observed experimental intra-speaker token-to-token variability. The present paper proposes an alternative approach by formulating feedforward optimal control in a probabilistic Bayesian modeling framework. This is illustrated by controlling a biomechanical model of the vocal tract for speech production and by comparing it with an existing optimal control model (GEPPETO). The essential elements of this optimal control model are presented first. From them the Bayesian model is constructed in a progressive way. Performance of the Bayesian model is evaluated based on computer simulations and compared to the optimal control model. This approach is shown to be appropriate for solving the speech planning problem while accounting for variability in a principled way.
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https://hal.archives-ouvertes.fr/hal-01297922
Contributor : Jean-François Patri <>
Submitted on : Wednesday, April 6, 2016 - 3:58:26 PM
Last modification on : Thursday, May 14, 2020 - 1:32:53 AM
Document(s) archivé(s) le : Thursday, July 7, 2016 - 4:42:36 PM

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  • HAL Id : hal-01297922, version 1

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Jean-François Patri, Julien Diard, Pascal Perrier, Jean-Luc Schwartz. A Bayesian framework for speech motor control. Workshop: Probabilistic Inference and the Brain, Stanislas Dehaene (CEA, Inserm, Collège de France - France) Alain Destexhe (EITN CNRS-UNIC - France) Wolfgang Maass (Graz University - Austria) Florent Meyniel (CEA - France), Sep 2015, Paris, France. ⟨hal-01297922⟩

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