Degrees of freedom of tongue movements in speech may be constrained by biomechanics.Report as inadecuate

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* Corresponding author 1 ICP - Institut de la communication parlée 2 RLE - Research Laboratory of Electronics Cambridge 3 GMCAO TIMC-IMAG - Techniques de l-Ingénierie Médicale et de la Complexité - Informatique, Mathématiques et Applications Grenoble

Abstract : A number of studies carried out on different languages have found that tongue movements in speech are made along two primary degrees of freedom d.f.s: the high-front to low-back axis and the high-back to low-front axis. We explore the hypothesis that these two main d.f.s could find their origins in the physical properties of the vocal tract. A large set of tongue shapes was generated with a biomechanical tongue model using a Monte-Carlo method to thoroughly sample the muscle control space. The resulting shapes were analyzed with PCA. The first two factors explain 84% of the variance, and they are similar to the two experimentally observed d.f.s. This finding suggests that the d.f.s. are not speech-specific, and that speech takes advantage of biomechanically based tongue properties to form different sounds.

Keywords : tongue model biomechanics speech production motor control

Author: Pascal Perrier - Joseph Perkell - Yohan Payan - Majid Zandipour - Franck Guenther - Ali Khalighi -



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