Back     Close

A Study on Articulatory Movements of Pathological Tongue based on a 3D Physiological Articulatory Simulator
Satoru Fujita, Jianwu Dang1, Kiyoshi Honda

An articulatory simulator is beneficial useful to predict potential disorders caused by partial glossectomy and their possible recovery process by rehabilitation. To construct such a 3D physiological articulatory simulator, this study extended the existing partial 3D physiological articulatory model (Dang and Honda, 2004) to a full three-dimensional model. In the 3D simulator, the tongue tissue was represented as a semi-continuum structure with 240 cubic meshes, each of which consists of 28 viscoelastic cylinders. The muscles were arranged with bilateral symmetry while they can be controlled asymmetrically in simulating pathological situations. The displacement-based FEM was adopted to realize the fast and large deformation of the tongue. The feasibility of the articulatory simulator was verified by producing articulatory movement for normal speech. To simulate pathological condition of the tongue such as partial glossectomy, soft tissue and muscles of the tongue were partially removed from the simulator, and then the same muscle activation pattern was used as that used in normal speech to form vowel configurations. Plausible movements for pathological situations were confirmed by comparing with those for the normal situation.

Back     Close