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Journal of Speech, Language, and Hearing Research Vol.44 1257-1267 December 2001. doi:10.1044/1092-4388(2001/098)
© American Speech-Language-Hearing Association
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Covariation of Cochlear Implant Users' Perception and Production of Vowel Contrasts and Their Identification by Listeners With Normal Hearing

Jennell C. Vick 1
Harlan Lane 2
Joseph S. Perkell 1
Melanie L. Matthies 3
John Gould 3

Majid Zandipour 4
1 Massachusetts Institute of Technology Cambridge
2 Massachusetts Institute of Technology Cambridge and Northeastern University Boston, MA
3 Massachusetts Institute of Technology Cambridge, MA and Boston University Boston, MA
4 Massachusetts Institute of Technology Cambridge, MA

jennell{at}speech.mit.edu

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.

KEY WORDS: cochlear implant(s), vowel production, vowel perception, speech, postlingually deaf

Submitted on December 5, 2000
Accepted on July 23, 2001


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H. Lane, M. L. Matthies, F. H. Guenther, M. Denny, J. S. Perkell, E. Stockmann, M. Tiede, J. Vick, and M. Zandipour
Effects of Short- and Long-Term Changes in Auditory Feedback on Vowel and Sibilant Contrasts
J Speech Lang Hear Res, August 1, 2007; 50(4): 913 - 927.
[Abstract] [Full Text] [PDF]


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