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Laryngeal muscle activity during stuttering

F J Freeman, T Ushijima

Journal of Speech and Hearing Research

|September 1, 1978

Summary

This study found that stuttering involves increased laryngeal muscle activity and disrupted coordination between vocal cord muscles. These findings suggest a significant role for laryngeal dysfunction in the speech disorder known as stuttering.

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Area of Science:

Speech and Hearing Science
Neuroscience
Laryngology

Background:

Stuttering is a complex speech disorder affecting fluency.
The underlying physiological mechanisms of stuttering are not fully understood.
Laryngeal muscle function is crucial for voice production and speech.

Purpose of the Study:

To investigate laryngeal muscle activity during fluent and stuttered speech.
To determine the relationship between laryngeal muscle activity patterns and stuttering events.
To explore the potential laryngeal component in the pathophysiology of stuttering.

Main Methods:

Electromyography (EMG) was used to record laryngeal muscle activity.
Muscle activity was analyzed during both fluent and stuttered speech productions.
The reciprocity between laryngeal abductor and adductor muscle groups was assessed.

Main Results:

Stuttered utterances were associated with significantly higher levels of laryngeal muscle activity compared to fluent utterances.
Abnormal muscle activity patterns, including disrupted reciprocity between abductor and adductor muscles, were observed during stuttering.
A strong correlation was found between aberrant laryngeal muscle activation and the occurrence of stuttering moments.

Conclusions:

The results provide evidence for a laryngeal component contributing to stuttering.
Abnormal laryngeal muscle activity is a key physiological correlate of stuttering.
Further research into laryngeal function may offer new insights into stuttering treatment strategies.

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