MANDIBULAR ROTATION AND TRANSLATION DURING SPEECH (PRODUCTION, JAW MOVEMENT, ARTICULATION).
Item
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Title
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MANDIBULAR ROTATION AND TRANSLATION DURING SPEECH (PRODUCTION, JAW MOVEMENT, ARTICULATION).
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Identifier
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AAI8601636
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identifier
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8601636
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Creator
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EDWARDS, JAN.
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Contributor
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Katherine S. Harris
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Date
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1985
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Language
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English
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Publisher
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City University of New York.
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Subject
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Speech Communication
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Abstract
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A two-dimensional rigid-body model of jaw movement was used to describe jaw opening and closing gestures for vowels and for bilabial and alveolar consonants. Jaw movements associated with VC and CV demisyllables were decomposed into three components: rotation about the terminal hinge axis, and the horizontal and vertical translation of that axis. The three-component model was chosen on anatomical and physiological grounds. Data were collected for three subjects, each of whom was recorded on two separate occasions. Multiple regression analysis was used to examine the relationships among the components of jaw movement across changes in the segmental, suprasegmental, and coarticulatory context. The results of the multiple regression analyses revealed consistent inter-subject differences: for two subjects, but not for the third, an interdependence between jaw rotation and the first principal component of jaw translation was observed. It was hypothesized that this inter-subject difference could be predicted on the basis of Occlusal Class differences. For these two subjects, the first degree of freedom of jaw movement corresponded to a combination of rotation and the first principal component of translation. For the third subject, the first degree of freedom of jaw movement corresponded to rotation alone. For all three subjects, the first degree of freedom accounted for a consistently high percentage of maximum jaw displacement measured at the front teeth. The contribution of the first principal component of jaw movement to mid-tongue displacement at maximum displacement was calculated using three models: the three-component model, a pure rotation model, and a pure translation model. It was found that the predictions of the pure rotation model were consistently more accurate than those of the pure translation model across the three subjects. However, using the pure rotation model, as compared to the three-component model, to calculate the jaw component of mid-tongue displacement introduced small errors both in magnitude and in direction for those two of the three subjects for whom translation and rotation were inter-related. The fact that the three-component model was sensitive to phonetic context effects and that it was robust enough to preserve inter-subject differences across two separate recording sessions suggests that this model provides a useful description of jaw movement during speech.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Speech & Hearing
