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Journal of Speech and Hearing Research Vol.39 396-401 April 1996.
© American Speech-Language-Hearing Association
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Fluency Effect of Frequency Alterations of Plus/Minus One-Half and One-Quarter Octave Shifts in Auditory Feedback of People Who Stutter

Andrew Stuart 1
Joseph Kalinowski 2
Joy Armson 3
Robert Stenstrom 4

Kathleen Jones 5
1 Department of Psychology Dalhousie University Halifax, Nova Scotia, Canada
2 Department of Communication Sciences and Disorders East Carolina University Greenville, NC
3 School of Human Communication Disorders Dalhousie University Halifax, Nova Scotia, Canada
4 Department of Epidemiology and Biostatistics McGill University Montréal, Québec, Canada
5 State University of New York at Geneseo

astuart{at}ac.dal.ca

The effect of frequency alterations in auditory feedback of people who stutter on stuttering frequency was investigated. Twelve participants who stutter read aloud under nonaltered auditory feedback (NAF) and four conditions of frequency-altered feedback ([FAF], plus/minus one-half and one-quarter octaves) at normal and fast speech rates. Stuttering frequency was significantly higher while reading aloud with NAF relative to the four conditions of FAF (p < 0.05). There were no differences among participants' stuttering frequency between the four FAF conditions (p > 0.05). Reductions in stuttering frequency of approximately 50% to 60% were found with FAF relative to NAF. More disfluencies occurred with the fast versus the normal speech rate condition (p=.0007) irrespective of auditory feedback condition. These findings suggest that slight alterations in the frequency of auditory feedback of people who stutter are fluency-enhancing.

KEY WORDS: frequency altered feedback, stuttering, fluency

Submitted on July 18, 1995
Accepted on September 20, 1995


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