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A methodological study of hemilaryngeal phonation

J J Jiang¹, I R Titze

¹Department of Speech Pathology and Audiology, University of Iowa, Iowa City 52242-1012.

The Laryngoscope

|August 1, 1993

Summary

This study found that a hemilarynx (half larynx) model retains similar vocal fold vibration and phonation threshold pressure to a full larynx. However, airflow and sound pressure level were reduced in the hemilarynx model.

Area of Science:

Laryngology
Bioacoustics
Speech Science

Background:

Understanding vocal fold dynamics is crucial for diagnosing and treating voice disorders.
Excised larynx models provide a controlled environment to study phonation mechanisms.

Purpose of the Study:

To develop and evaluate an excised hemilarynx model for studying phonatory characteristics.
To compare the phonatory parameters of a hemilarynx with a full larynx.

Main Methods:

An excised hemilarynx model was created by removing one vocal fold and replacing it with a plexiglass plate.
Phonation was induced, and measurements of phonation threshold pressure, sound pressure level, glottal flow, fundamental frequency, and vocal fold vibration amplitude were recorded.
Intraglottal pressure and vocal fold contact area were measured in the hemilarynx model.

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Main Results:

Hemilarynx vocal fold vibration amplitude and frequency, along with their response to subglottal pressure, were similar to the full larynx.
Phonation threshold pressures and the range of subglottal pressures for phonation were comparable between the hemilarynx and full larynx.
The hemilarynx exhibited approximately half the average airflow and one-fourth the sound pressure level of the full larynx.

Conclusions:

The hemilarynx model effectively replicates key phonatory behaviors of the full larynx, particularly in vibration dynamics and pressure thresholds.
The reduced airflow and sound pressure level in the hemilarynx model highlight the contribution of the intact vocal fold to overall voice production intensity.
This hemilarynx model serves as a valuable tool for investigating specific aspects of vocal fold function and voice production.