Covariation of Cochlear Implant Users' Perception and Production of Vowel Contrasts and Their Identification by Listeners With Normal Hearing This study investigates covariation of perception and production of vowel contrasts in speakers who use cochlear implants and identification of those contrasts by listeners with normal hearing. Formant measures were made of seven vowel pairs whose members are neighboring in acoustic space. The vowels were produced in carrier phrases by ... Research Article
Research Article  |   December 01, 2001
Covariation of Cochlear Implant Users' Perception and Production of Vowel Contrasts and Their Identification by Listeners With Normal Hearing
 
Author Affiliations & Notes
  • Jennell C. Vick
    Massachusetts Institute of Technology Cambridge
  • Harlan Lane
    Massachusetts Institute of Technology Cambridge and Northeastern University Boston, MA
  • Joseph S. Perkell
    Massachusetts Institute of Technology Cambridge, MA and Boston University Boston, MA
  • Melanie L. Matthies
    Massachusetts Institute of Technology Cambridge, MA and Boston University Boston, MA
  • John Gould
    Massachusetts Institute of Technology Cambridge, MA
  • Majid Zandipour
    Massachusetts Institute of Technology Cambridge, MA
  • Corresponding author: e-mail: jennell@speech.mit.edu
  • Currently affiliated with the Hebrew Rehabilitation Center for Aged, Boston, MA
    Currently affiliated with the Hebrew Rehabilitation Center for Aged, Boston, MA×
Article Information
Hearing & Speech Perception / Hearing Aids, Cochlear Implants & Assistive Technology / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   December 01, 2001
Covariation of Cochlear Implant Users' Perception and Production of Vowel Contrasts and Their Identification by Listeners With Normal Hearing
Journal of Speech, Language, and Hearing Research, December 2001, Vol. 44, 1257-1267. doi:10.1044/1092-4388(2001/098)
History: Received December 5, 2000 , Accepted July 23, 2001
 
Journal of Speech, Language, and Hearing Research, December 2001, Vol. 44, 1257-1267. doi:10.1044/1092-4388(2001/098)
History: Received December 5, 2000; Accepted July 23, 2001
Web of Science® Times Cited: 18

This study investigates covariation of perception and production of vowel contrasts in speakers who use cochlear implants and identification of those contrasts by listeners with normal hearing. Formant measures were made of seven vowel pairs whose members are neighboring in acoustic space. The vowels were produced in carrier phrases by 8 postlingually deafened adults, before and after they received their cochlear implants (CI).

Improvements in a speaker's production and perception of a given vowel contrast and normally hearing listeners' identification of that contrast in masking noise tended to occur together. Specifically, speakers who produced vowel pairs with reduced contrast in the pre-CI condition (measured by separation in the acoustic vowel space) and who showed improvement in their perception of these contrasts post-CI (measured with a phoneme identification test) were found to have enhanced production contrasts post-CI in many cases. These enhanced production contrasts were associated, in turn, with enhanced masked word recognition, as measured from responses of a group of 10 normally hearing listeners. The results support the view that restoring self-hearing allows a speaker to adjust articulatory routines to ensure sufficient perceptual contrast for listeners.

Acknowledgments
This project was supported by grant no. R01-DC003007 from the National Institute on Deafness and Other Communication Disorders, National Institutes of Health. We are especially grateful to Ms. Pei-Lin Hung for her work on data extraction. We would also like to express our gratitude to Dr. Arlene Carney and two anonymous reviewers of this manuscript.
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