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The effect of viscosity changes in the vocal folds on the range of oscillation |
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| Authors: | Benjamin K. Finkelhor Ingo R. Titze Paul L. Durham |
| Affiliation: | 1Department of Otolaryngology-Head and Neck Surgery, University of Iowa Hospitals and Clinics, U.S.A. *Wendell Johnson Speech and Hearing Center, University of Iowa, Iowa City, Iowa, U.S.A. |
| Abstract: | Changes in vocal fold oscillation threshold pressure were induced in excised canine larynges by experimentally causing fluid movement into and out of the vocal folds. The transport was facilitated by exposing the vocal folds to various osmotic solutions, and it was assumed that changes in hydration caused changes in the internal tissue viscosity. A range of oscillation threshold pressures was measured for each condition of hydration by varying length and glottal width. The oscillation threshold pressure shifted as predicted. Decreased hydration (increased viscosity) raised the threshold of oscillation, and increased hydration (decreased viscosity) lowered the threshold of oscillation. This apparently represents the first in vitro model for the study of the effect of viscosity changes of the internal environment of the vocal folds on phonation. |
| Keywords: | Viscosity Vocal folds Oscillation Larynx Phonation |
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