Effects of Short- and Long-Term Changes in Auditory Feedback on Vowel and Sibilant Contrasts Purpose To assess the effects of short- and long-term changes in auditory feedback on vowel and sibilant contrasts and to evaluate hypotheses arising from a model of speech motor planning. Method The perception and production of vowel and sibilant contrasts were measured in 8 postlingually deafened adults prior ... Research Article
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Research Article  |   August 01, 2007
Effects of Short- and Long-Term Changes in Auditory Feedback on Vowel and Sibilant Contrasts
 
Author Affiliations & Notes
  • Harlan Lane
    Northeastern University, Boston, and Massachusetts Institute of Technology, Cambridge
  • Melanie L. Matthies
    Boston University and Massachusetts Institute of Technology
  • Frank H. Guenther
    Boston University and Massachusetts Institute of Technology
  • Margaret Denny
    Massachusetts Institute of Technology
  • Joseph S. Perkell
    Massachusetts Institute of Technology and Boston University
  • Ellen Stockmann
    Massachusetts Institute of Technology
  • Mark Tiede
    Massachusetts Institute of Technology and Haskins Laboratories, New Haven, CT
  • Jennell Vick
    University of Washington, Seattle, and Massachusetts Institute of Technology
  • Majid Zandipour
    Massachusetts Institute of Technology and Boston University
  • Contact author: Harlan Lane, 15 Rutland Square, Boston, MA 02118. E-mail: lane@neu.edu.
Article Information
Hearing & Speech Perception / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   August 01, 2007
Effects of Short- and Long-Term Changes in Auditory Feedback on Vowel and Sibilant Contrasts
Journal of Speech, Language, and Hearing Research, August 2007, Vol. 50, 913-927. doi:10.1044/1092-4388(2007/065)
History: Received May 1, 2006 , Accepted January 29, 2007
 
Journal of Speech, Language, and Hearing Research, August 2007, Vol. 50, 913-927. doi:10.1044/1092-4388(2007/065)
History: Received May 1, 2006; Accepted January 29, 2007
Web of Science® Times Cited: 15

Purpose To assess the effects of short- and long-term changes in auditory feedback on vowel and sibilant contrasts and to evaluate hypotheses arising from a model of speech motor planning.

Method The perception and production of vowel and sibilant contrasts were measured in 8 postlingually deafened adults prior to activation of their cochlear implant speech processors, 1 month postactivation, and 1 year postactivation. Measures were taken postactivation both with and without auditory feedback. Contrast measures were also made for a group of speakers with reportedly normal hearing speaking with masked and unmasked auditory feedback.

Results Vowel and sibilant contrasts, measured in the absence of auditory feedback after 1 month of prosthesis use, were diminished compared with their values measured before prosthesis. Contrasts measured in the absence of auditory feedback after 1 year’s experience with the prosthesis were increased compared with their values after 1 month’s experience. In both time samples, contrasts were enhanced when auditory feedback was restored.

Conclusion The provision of prosthetic hearing to postlingually deafened adults impaired their phonemic contrasts at first, as their auditory feedback had novel characteristics. Once auditory feedback became recalibrated with prosthesis use, it could, in turn, revise feedforward commands that control the contrasts in its absence.

Acknowledgments
This research was supported by Grant R01-DC003007 from the National Institute on Deafness and Other Communication Disorders. We are grateful to Donald Eddington of the Massachusetts Eye and Ear Infirmary and to Daniel Lee of the Department of Otolaryngology–Head and Neck Surgery, University of Massachusetts Medical School, for referring CI users to our study.
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