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Bifurcations in excised larynx experiments

D A Berry1, H Herzel, I R Titze

  • 1Department of Speech Pathology and Audiology, University of Iowa, Iowa City 52242, USA.

Journal of Voice : Official Journal of the Voice Foundation
|June 1, 1996
PubMed
Summary
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This study used bifurcation analysis to understand vocal fold vibration, revealing different phonatory regimes and instabilities. These findings correlate vocal registers with observed vibration patterns, offering insights into voice production.

Area of Science:

  • Acoustics
  • Biomechanics
  • Voice Science

Background:

  • Vocal fold vibration is crucial for phonation.
  • Understanding vocal instabilities is key to voice disorders.
  • Previous studies have explored phonation but lacked detailed bifurcation analysis.

Purpose of the Study:

  • To apply bifurcation analysis to excised larynx experiments.
  • To investigate phonation onset and vocal instabilities.
  • To map phonatory regimes and their relationship to vocal registers.

Main Methods:

  • Utilized excised larynx experiments.
  • Performed bifurcation analysis in a parameter plane (subglottal pressure, vocal fold asymmetry).
  • Generated two-dimensional bifurcation diagrams, spectrograms, and fundamental frequency contours.

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Main Results:

  • Observed various phonatory regimes, including single vocal fold oscillations.
  • Found correlations between phonatory regimes and vocal registers.
  • Identified numerous instabilities and bifurcations in regions of phonatory regime coexistence.

Conclusions:

  • Bifurcation analysis effectively characterizes vocal fold vibration and instabilities.
  • Results provide a framework for understanding vocal registers and voice production.
  • The findings have potential implications for clinical voice observations.