Visualization and quantification of the medial surface dynamics of an excised human vocal fold during phonation
Visualization and quantification of the medial surface dynamics of an excised human vocal fold during phonation
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DOI：
10.1016/j.jvoice.2005.08.003
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发表时间：
2006-09-01
期刊：
影响因子：
2.2
通讯作者：
Berry, David A.
中科院分区：
文献类型：
--
作者：
Doellinger, Michael;Berry, David A.
这项研究的目的是通过对声带内侧表面动力学的量化来研究正常发声过程中声带振动的物理机制。使用切除的半喉装置。在18种发声条件下，分析了30个安装在人类声带内侧表面的微缝合线的动态。这些振动是用一台频率为4000赫兹的数字高速摄像机记录下来的。利用线性逼近技术提取缝线位置并转换为三维坐标。数据被简化为主特征函数，捕获了90%以上的数据方差，并提出了持续声带振荡的机制。在以下发声条件下对振动进行成像：声门气流，施加于肌肉过程的内收力，以及施加于甲状腺软骨的伸长力。在研究的变量范围内，只有声门气流的变化产生了声门下压力和基频的显著变化。所有的记录显示高度相关的动态分布横跨声带内侧表面。不同位移方向和速度的分布在内侧表面上缘附近变化最大。尽管计算出的两个最大的经验特征函数的振动模式与先前的实验观察结果一致，但两个特征函数的相对突出程度随着声门气流的变化而变化，从而影响了声音效率和声音经济性的理论。
The put-pose of this investigation was to investigate physical mechanisms of vocal fold vibration during normal phonation through quantification of the medial surface dynamics of the fold. An excised hemilarynx setup was used. The dynamics of 30 microsutures mounted on the medial surface of a human vocal fold were analyzed across 18 phonatory conditions. The vibrations were recorded with a digital high-speed camera at a frequency of 4000 Hz. The positions of the sutures were extracted and converted to three-dimensional coordinates using a linear approximation technique. The data were reduced to principal eigenfuctions, which captured over 90% of the variance of the data, and suggested mechanisms of sustained vocal fold oscillation. The vibrations were imaged as the following phonatory conditions were manipulated: glottal airflow, an adductory force applied to the muscular process, and an elongation force applied to the thyroid cartilage. Over the range of variables studied, only the variation in glottal airflow yielded significant changes in subglottal pressure and fundamental frequency. All recordings showed high cot-relation for the distribution of the dynamics across the medial surface of the vocal fold. The distribution of the different displacement directions and velocities showed the highest variations around the superior region of the medial surface. Although the computed vibration patterns of the two largest empirical eigenfunctions were consistent with previous experimental observations, the relative prominence of the two eigenfunctions changed as a function of glottal airflow, impacting theories of vocal efficiency and vocal economy.