Scheible Florian, Lamprecht Raphael, Schaan Casey, Veltrup Reinhard, Henningson Jann-Ole, Semmler Marion, Sutor Alexander
Institute of Measurement and Sensor Technology, UMIT TIROL - Private University for Health Sciences and Health Technology, Eduard-Wallnöfer-Zentrum 1, 6060 Hall in Tirol, Austria.
Division of Phoniatrics and Pediatric Audiology, Department of Otorhinolaryngology, Head- and Neck Surgery, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany.
J Voice. 2023 Mar 31. doi: 10.1016/j.jvoice.2023.03.001.
The vibration of the vocal folds produces the primary sound for the human speech. The vibration depends mainly on the pressure, airflow of the lungs, and the material properties of the vocal folds. In order to change them, muscles in the larynx stretch the vocal folds. This interplay is rarely investigated, but can give insight in the complex process of speech production. Most material properties studies are damaging the tissue; therefore, a nondestructive one is desired.
An ex vivo phonation experiment combined with the dynamic Pipette Aspiration Technique is used to investigate 10 porcine larynges, under manipulations of different adduction and elongation levels. For each manipulation, the near surface material properties of the vocal folds are measured as well as different phonation parameters like the subglottal pressure, glottal resistance, frequency, and stiffness. Thereby, a high-speed camera was used to record the vocal fold movement.
On most of the measured parameters, the manipulations do show an effect. Both manipulations lead to a higher phonation frequency and an increase of the stiffness of the tissue. Comparing both manipulations, the elongation results in higher elasticity values than the adduction. Different measurement parameters have been compared with each other and correlations could be found. Where the strongest correlation are found among the elasticity values of different frequencies. But it can also be seen that the elasticity values correlate with phonation parameters.
It was possible to produce a data set of 560 measurements in total. To our knowledge, this is the first time Pipette Aspiration Technique was combined with ex vivo phonation measurements for combined measurements. The amount of measurement data made it possible to carry out statistic investigations. The effect of the manipulations on material properties as well as on phonation parameters could be measured and different correlations could be found. The results lead to the hypothesis that the stretch does not have a huge effect on the material properties of the lamina propria, but more on the underlying muscle.
声带的振动产生人类语音的基本声音。这种振动主要取决于压力、肺部气流以及声带的材料特性。为了改变这些因素，喉部的肌肉会拉伸声带。这种相互作用很少被研究，但可以深入了解复杂的语音产生过程。大多数材料特性研究都会对组织造成损伤；因此，需要一种非破坏性的研究方法。
采用体外发声实验结合动态移液管抽吸技术，对10个猪喉进行不同内收和伸长水平的操作。对于每种操作，测量声带的近表面材料特性以及不同的发声参数，如声门下压力、声门阻力、频率和刚度。为此，使用高速摄像机记录声带运动。
在大多数测量参数上，操作确实显示出了效果。两种操作都导致发声频率升高和组织刚度增加。比较两种操作，伸长导致的弹性值高于内收。对不同的测量参数进行了相互比较，并发现了相关性。在不同频率的弹性值之间发现了最强的相关性。但也可以看出，弹性值与发声参数相关。
总共获得了560个测量数据集。据我们所知，这是首次将移液管抽吸技术与体外发声测量相结合进行联合测量。测量数据的数量使得进行统计研究成为可能。可以测量操作对材料特性以及发声参数产生的影响，并发现不同的相关性。结果得出一个假设，即拉伸对固有层的材料特性影响不大，而对其下方的肌肉影响更大。
