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Journal of Speech, Language, and Hearing Research Vol.40 361-372 April 1997.
© American Speech-Language-Hearing Association

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Experimental Investigation of the Effects of Frequency-Altered Auditory Feedback on the Speech of Adults Who Stutter

Roger J. Ingham 1
Richard A. Moglia 1
Peter Frank 1
Janis Costello Ingham 1

Anne K. Cordes 2

1 University of California, Santa Barbara
2 University of Georgia Athens

rjingham{at}ucsbuxa.ucsb.edu

A series of single-subject experiments evaluated the effects of frequency-altered auditory feedback (FAF) on the speech performance of four adult males who stutter. Using alterations of plus or minus one octave, FAF was compared with normal auditory feedback (NAF) in oral reading and spontaneous speech with measurements made of stuttered intervals, stutter-free speech rate, and speech naturalness. The effects of extended FAF conditions on spontaneous speech were also evaluated for two subjects who demonstrated a positive response to FAF. Results showed no consistencies across subjects in responses to FAF: One subject showed no response, another produced an initial temporary response, a third showed a deterioration in speech quality with minimal reductions in stuttering, and a fourth displayed substantial and sustained improvements in speech performance. Some implications of these findings for current research and theory about the relationship between stuttering and FAF are discussed.

KEY WORDS: stuttering, frequency-altered feedback, treatment

Submitted on May 29, 1996
Accepted on September 12, 1996


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