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A computational study of depth of vibration into vocal fold tissues
Journal article   Peer reviewed

A computational study of depth of vibration into vocal fold tissues

Anil Palaparthi, Simeon Smith, Ted Mau and Ingo R. Titze
The Journal of the Acoustical Society of America, Vol.145(2), pp.881-891
02/2019
DOI: 10.1121/1.5091099
PMCID: PMC6380906
PMID: 30823802
url
https://www.ncbi.nlm.nih.gov/pmc/articles/6380906View
Open Access

Abstract

The effective depth of vocal fold vibration is self-regulated and generally not known a priori in vocalization. In this study, the effective depth was quantified systematically under various phonatory conditions using a fiber-gel finite element vocal fold model. The horizontal and vertical excursions of each finite element nodal point trajectory were recorded to compute trajectory areas. The extent of vibration was then studied based on the variation of trajectory radii as a function of depth in several coronal sections along the anterior-posterior direction. The results suggested that the vocal fold nodal trajectory excursions decrease systematically as a function of depth but are affected by the layered structure of the vocal folds. The effective depth of vibration was found to range between 15 and 55% of the total anatomical depth across all phonatory conditions. The nodal trajectories from the current study were compared qualitatively with the results from excised human hemi-larynx experiments published in Döllinger and Berry [(2006). J. Voice. 20(3), 401–413]. An estimate of the effective mass of a one-mass vocal fold model was also computed based on the effective depth of vibration observed in this study under various phonatory conditions.

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