This study was performed in accordance with the PHS Policy on Humane Care and Use of Laboratory Animals, and the Animal Welfare Act (7 U.S.C. et seq.); the animal use protocol was approved by the Institutional Animal Care and Use Committee (IACUC) of the University of Cincinnati, and supported by grant 5K08DC005421 from the National Institutes of Health/National Institute on Deafness and Other Communication Disorders.
Role of vortices in voice production: Normal versus asymmetric tension†
Article first published online: 31 DEC 2008
Copyright © 2009 The American Laryngological, Rhinological, and Otological Society, Inc.
Volume 119, Issue 1, pages 216–221, January 2009
How to Cite
Khosla, S., Murugappan, S., Paniello, R., Ying, J. and Gutmark, E. (2009), Role of vortices in voice production: Normal versus asymmetric tension. The Laryngoscope, 119: 216–221. doi: 10.1002/lary.20026
- Issue published online: 31 DEC 2008
- Article first published online: 31 DEC 2008
- Manuscript Accepted: 17 SEP 2008
- National Institutes of Health/National Institute on Deafness and Other Communication Disorders. Grant Number: 5K08DC005421
- Vocal fold vibration;
- asymmetric vocal fold motion;
- voice production;
- laryngeal physiology
Decreasing the closing speed of the vocal folds can reduce loudness and energy in the higher frequency harmonics, resulting in reduced voice quality. Our aim was to study the correlation between higher frequencies and the intraglottal vorticity (which contributes to rapid closing by producing transient negative intraglottal pressures).
Using six excised canine larynges (three with symmetric and three with asymmetric, periodic vocal fold motion), intraglottal vorticity was calculated from 2D velocity fields measured using particle imaging velocimetry.
There is a strong correlation between intraglottal vorticity and acoustic energy in the higher frequencies; in periodic asymmetric motion, the vorticity and higher frequencies are both reduced.
For unilateral vocal fold paralysis, these findings suggest one reason why periodic, asymmetric motion, may produce an abnormal voice. Further study will help determine when and why reinnervation, as opposed to medialization, may result in better voice quality. Laryngoscope, 119:216–221, 2009