Dynamic vocal fold parameters with changing adduction in ex-vivo hemilarynx experiments

Ex-vivo hemilarynx experiments allow the visualization and quantification of three-dimensional dynamics of the medial vocal fold surface. For three excised human male larynges, the vibrational output, the glottal flow resistance, and the sound pressure during sustained phonation were analyzed as a f...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2016-05, Vol.139 (5), p.2372-2385
Main Authors: Döllinger, Michael, Berry, David A., Kniesburges, Stefan
Format: Article
Language:English
Subjects:
Adult
Aged
Airway Resistance
Cadaver
Humans
Larynx - anatomy & histology
Larynx - physiology
Male
Motion
Phonation
Pressure
Sound
Speech Communication
Surface Properties
Time Factors
Vibration
Vocal Cords - anatomy & histology
Vocal Cords - physiology
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Summary:Ex-vivo hemilarynx experiments allow the visualization and quantification of three-dimensional dynamics of the medial vocal fold surface. For three excised human male larynges, the vibrational output, the glottal flow resistance, and the sound pressure during sustained phonation were analyzed as a function of vocal fold adduction for varying subglottal pressure. Empirical eigenfunctions, displacements, and velocities were investigated along the vocal fold surface. For two larynges, an increase of adduction level resulted in an increase of the glottal flow resistance at equal subglottal pressures. This caused an increase of lateral and vertical oscillation amplitudes and velocity indicating an improved energy transfer from the airflow to the vocal folds. In contrast, the third larynx exhibited an amplitude decrease for rising adduction accompanying reduction of the flow resistance. By evaluating the empirical eigenfunctions, this reduced flow resistance was assigned to an unbalanced oscillation pattern with predominantly lateral amplitudes. The results suggest that adduction facilitates the phonatory process by increasing the glottal flow resistance and enhancing the vibrational amplitudes. However, this interrelation only holds for a maintained balanced ratio between vertical and lateral displacements. Indeed, a balanced vertical-lateral oscillation pattern may be more beneficial to phonation than strong periodicity with predominantly lateral vibrations.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.4947044