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Timing control accuracy in normal speakers and stutterers

M H Cooper, G D Allen

Journal of Speech and Hearing Research

|March 1, 1977

Summary

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This study found that normal speakers exhibit superior temporal accuracy in speech timing compared to stutterers. Stutterers in therapy showed less timing control than those no longer in therapy, suggesting therapy benefits speech timing abilities.

Area of Science:

Speech-Language Pathology
Neuroscience
Psychology

Background:

Speech timing is crucial for fluency.
Stuttering is a complex disorder affecting speech production.
Understanding temporal control deficits in stuttering is essential for effective therapy.

Purpose of the Study:

To assess the temporal control abilities of normal speakers and stutterers.
To compare timing accuracy between stutterers in therapy and those no longer in therapy.
To investigate the relationship between speech timing and a non-speech motor task.

Main Methods:

Participants included normal speakers and two groups of stutterers (in therapy, no longer in therapy).
Speech tasks involved repeated sentences, paragraphs, and nursery rhymes.

Related Experiment Videos

A finger-tapping task served as a control for temporal accuracy measurement.

Main Results:

Normal speakers demonstrated greater temporal accuracy than stutterers across most tasks.
Stutterers no longer in therapy showed improved timing accuracy compared to those still in therapy.
Speech timing scores moderately correlated with finger-tapping task scores.

Conclusions:

Stutterers may have limitations in speech motor output buffer capacity.
Therapy may enhance temporal control mechanisms in stutterers.
Timing control deficits contribute to stuttering, influenced by factors like rhythmic constraints and respiratory irregularity.