Edwards J, Harris K S
Hunter College of the City University of New York.
J Speech Hear Res. 1990 Sep;33(3):550-62. doi: 10.1044/jshr.3303.550.
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 were decomposed into three components: (a) rotation about the terminal hinge axis, (b) the horizontal translation of that axis, and (c) the vertical translation of that axis. Data were collected for 3 subjects in two separate recording sessions. Multiple regression analysis was used to examine the relationships among the three jaw movement components. For 2 subjects, but not for the third, an interdependence between jaw rotation and the first principal component of jaw translation, horizontal translation, was observed. For these 2 subjects, the first degree of freedom of jaw movement corresponded to a combination of rotation and the first principal component of jaw translation. For the third subject, the first degree of freedom of jaw movement corresponded to rotation alone. The results of this study, like those of Westbury (1988), indicate that an accurate description of jaw movement during speech requires the recording of two points of jaw movement.
采用二维刚体下颌运动模型来描述元音以及双唇音和齿龈音的下颌开合动作。下颌运动被分解为三个分量：(a) 绕终末铰链轴的旋转，(b) 该轴的水平平移，以及 (c) 该轴的垂直平移。在两个独立的记录时段收集了3名受试者的数据。使用多元回归分析来检验三个下颌运动分量之间的关系。在2名受试者中观察到了下颌旋转与下颌平移的第一主成分（水平平移）之间的相互依存关系，但第三名受试者未观察到这种关系。对于这2名受试者，下颌运动的第一自由度对应于旋转与下颌平移的第一主成分的组合。对于第三名受试者，下颌运动的第一自由度仅对应于旋转。本研究的结果与韦斯特伯里（1988年）的研究结果一样，表明在言语过程中准确描述下颌运动需要记录下颌运动的两个点。
