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Videoendoscopic analysis of laryngeal function during laughter

M J Citardi¹, E Yanagisawa, J Estill

¹Section of Otolaryngology, Yale University School of Medicine, New Haven, Connecticut, USA.

The Annals of Otology, Rhinology, and Laryngology

|July 1, 1996

Summary

Laughter involves rhythmic vocal fold movement. This study shows voluntary vocal fold control after laughter, offering potential speech therapy for hyperadductive disorders.

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Area of Science:

Laryngology
Speech Science
Physiology

Background:

Laughter is a universal human behavior but its physiological mechanisms, particularly laryngeal function, are not well understood.
Understanding vocal fold dynamics during laughter may reveal therapeutic applications for voice disorders.

Purpose of the Study:

To investigate laryngeal function during the act of laughter.
To determine if laughter facilitates voluntary control over vocal fold positioning.

Main Methods:

Telescopic and fiberscopic videolaryngoscopy were employed to observe five subjects during laughter.
Subjects produced laughter with various vowels, frequencies, and voice qualities.

Main Results:

Consistent rhythmic abduction and adduction of the vocal folds were observed during laughter.

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All subjects achieved voluntary control of paramedian vocal fold positioning post-laughter tasks.

Conclusions:

Laughter involves specific, rhythmic vocal fold movements.
The ability to gain voluntary vocal fold control after laughter suggests potential therapeutic benefits for speech disorders characterized by hyperadduction, such as vocal fold nodules.