Efficacy of the Modifying Phonation Intervals (MPI) Stuttering Treatment Program With Adults Who Stutter Purpose This study compared a new adult stuttering treatment program (Modifying Phonation Intervals, or MPI) with the standard of care for reducing stuttered speech in adults (prolonged speech). Method Twenty-seven adults who stutter were assigned to either MPI or prolonged speech treatment, both of which used similar infrastructures. ... Research Article
Research Article  |   May 2015
Efficacy of the Modifying Phonation Intervals (MPI) Stuttering Treatment Program With Adults Who Stutter
 
Author Affiliations & Notes
  • Roger J. Ingham
    University of California at Santa Barbara
  • Janis C. Ingham
    University of California at Santa Barbara
  • Anne K. Bothe
    University of Georgia, Athens
  • Yuedong Wang
    University of California at Santa Barbara
  • Martin Kilgo
    University of California at Santa Barbara
  • Correspondence to Roger J. Ingham: rjingham@speech.ucsb.edu
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication.×
  • Editor: Krista Wilkinson
    Editor: Krista Wilkinson×
  • Associate Editor: Nancy Hall
    Associate Editor: Nancy Hall×
  • Copyright © 2015 American Speech-Language-Hearing Association
Article Information
Speech, Voice & Prosodic Disorders / Fluency Disorders / Speech, Voice & Prosody / Research Articles
Research Article   |   May 2015
Efficacy of the Modifying Phonation Intervals (MPI) Stuttering Treatment Program With Adults Who Stutter
American Journal of Speech-Language Pathology, May 2015, Vol. 24, 256-271. doi:10.1044/2015_AJSLP-14-0076
History: Received June 5, 2014 , Revised October 25, 2014 , Accepted January 12, 2015
 
American Journal of Speech-Language Pathology, May 2015, Vol. 24, 256-271. doi:10.1044/2015_AJSLP-14-0076
History: Received June 5, 2014; Revised October 25, 2014; Accepted January 12, 2015
Acknowledgments
This study was completed with the support of RO1 Grant DC007893 from the National Institute on Deafness and Other Communication Disorders, awarded to the first author. Special thanks are offered to Peter Fox for providing the facilities for parts of this study and for his continuing support for imaging research on developmental stuttering. We also wish to acknowledge the developmental work on the MPI by Jack Montgomery at Cumberland College in Australia, Robert Bandes at the University of Washington, and Don Devan and Peter Frank at the University of California, Santa Barbara. Thanks are also due to Robin Selman Hampton, Krystal Purkheiser, Annie New, Kate Paolini, Gina Pecile, Amanda Petros, and multiple research assistants at the University of Georgia for their assistance in gathering data and background material.

Purpose This study compared a new adult stuttering treatment program (Modifying Phonation Intervals, or MPI) with the standard of care for reducing stuttered speech in adults (prolonged speech).

Method Twenty-seven adults who stutter were assigned to either MPI or prolonged speech treatment, both of which used similar infrastructures. Speech and related variables were assessed in 3 within-clinic and 3 beyond-clinic speaking situations for participants who successfully completed all treatment phases.

Results At transfer, maintenance, and follow-up, the speech of 14 participants who successfully completed treatment was similar to that of normally fluent adults. Successful participants also showed increased self-identification as a “normal speaker,” decreased self-identification as a “stutterer,” reduced short intervals of phonation, and some increased use of longer duration phonation intervals. Eleven successful participants received the MPI treatment, and 3 received the prolonged speech treatment.

Conclusions Outcomes for successful participants were very similar for the 2 treatments. The much larger proportion of successful participants in the MPI group, however, combined with the predictive value of specific changes in PI durations suggest that MPI treatment was relatively more effective at assisting clients to identify and change the specific speech behaviors that are associated with successful treatment of stuttered speech in adults.

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