Vocal fold vibration mode changes due to cricothyroid and thyroarytenoid muscle interaction in a three-dimensional model of the canine larynx
Vocal fold vibration mode changes due to cricothyroid and thyroarytenoid muscle interaction in a three-dimensional model of the canine larynx
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DOI：
10.1121/10.0005883
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发表时间：
2021-08-01
影响因子：
2.4
通讯作者：
Zheng, Xudong
中科院分区：
文献类型：
--
作者：
Geng, Biao;Movahhedi, Mohammadreza;Zheng, Xudong
使用基于犬喉磁共振成像的连续体模型，对发声过程中的声带振动进行参数模拟，其中环甲肌（CT）和甲杓肌（TA）独立激活从零到完全激活。在中等到高 CT 激活下，随着 TA 活性逐渐增加，基频 (f(0)) 首先增加，然后经历向下跳跃。适当的正交分解分析表明，声带振动主要由分别代表横向运动和旋转运动的两种模式主导，并且 f(0) 下降与两种模式的顺序切换相关。在另一个只有声乐活跃的参数集中，f(0) 随着 TA 和 CT 活动单调增加，并且没有发生模式切换。结果表明，TA中的主动应力导致主体和盖子之间存在较大的应力差异，对于旋转模式和模式切换的发生至关重要。相对较大的TA活性倾向于促进旋转模式，而相对较大的CT活性倾向于促进横向模式。结果还表明，振动模式通过影响 TA 应力对有效刚度的贡献来影响 f(0)。主模态的切换引起f(0)的非单调变化。
Using a continuum model based on magnetic resonance imaging of a canine larynx, parametric simulations of the vocal fold vibration during phonation were conducted with the cricothyroid muscle (CT) and the thyroarytenoid muscle (TA) independently activated from zero to full activation. The fundamental frequency (f(0)) first increased and then experienced a downward jump as TA activity gradually increased under moderate to high CT activation. Proper orthogonal decomposition analysis revealed that the vocal fold vibrations were dominated by two modes representing a lateral motion and rotational motion, respectively, and the f(0) drop was associated with a switch on the order of the two modes. In another parametric set where only the vocalis was active, f(0) increased monotonically with both TA and CT activity and the mode switch did not occur. The results suggested that the active stress in the TA, which causes large stress differences between the body and cover, is essential for the occurrence of the rotational mode and mode switch. Relatively greater TA activity tends to promote the rotational mode, while relatively greater CT activity tends to promote the lateral mode. The results also suggested that the vibration modes affected f(0) by affecting the contribution of the TA stress to the effective stiffness. The switch in the dominant mode caused the non-monotonic change of f(0).