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Related Experiment Videos

Phonatory vocal fold function in the excised canine larynx.

D H Slavit1, R J Lipton, T V McCaffrey

  • 1Department of Otorhinolaryngology, Mayo Clinic, Rochester, MN 55905.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|December 1, 1990
PubMed
Summary

Objective measurements of vocal cord vibration are crucial for laryngeal physiology. This study found that vocal fold tension and glottic width significantly impact vocal fold vibration parameters, offering insights for objective laryngeal assessments.

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Area of Science:

  • Laryngeal Physiology
  • Bioacoustics
  • Vocal Fold Mechanics

Background:

  • Objective measurement of vocal cord vibration during phonation is a key research area in laryngeal physiology.
  • Understanding the biomechanics of vocal fold vibration is essential for diagnosing and treating voice disorders.

Purpose of the Study:

  • To investigate the effects of vocal cord tension, airflow rate, and glottic width on glottographic parameters.
  • To establish objective measurements for assessing vocal fold vibratory patterns.

Main Methods:

  • Utilized an excised canine larynx model.
  • Simultaneously recorded electroglottography and photoglottography waveforms.
  • Systematically varied vocal cord tension, glottic width, and airflow rate.
  • Analyzed waveforms to determine open quotient and speed quotient using multiple regression analysis.

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Main Results:

  • Open quotient showed a direct relationship with vocal fold tension, glottic width, and fundamental frequency.
  • Speed quotient was inversely related to glottic width and subglottic pressure.
  • Vocal fold vibration frequency was directly related to tension and inversely related to glottic width.

Conclusions:

  • Open and speed quotients accurately reflect changes in vocal fold vibratory patterns due to alterations in tension and width.
  • Glottography provides an objective method for assessing laryngeal framework procedures.
  • These findings have significant clinical implications for voice disorder assessment and treatment.