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Interactions of speaking condition and auditory feedback on vowel production in postlingually deaf adults with cochlear implants

Lucie Ménard, Université du Québec à Montréal; Massachusetts Institute of Technology
Marek Polak, University of Miami
Margaret Denny, Massachusetts Institute of Technology
Ellen Burton, Johns Hopkins University; Maryland Association of County Health Officers
Harlan Lane, Northeastern University
Melanie L. Matthies, Boston University; Massachusetts Institute of Technology
Nicole Marrone, Boston University; Massachusetts Institute of Technology
Joseph S. Perkell, Massachusetts Institute of Technology; Boston University
Mark Tiede, Massachusetts Institute of Technology; Haskins Laboratories, Connecticut
Jennell Vick, University of Washington

Article comments

The following article appeared in J. Acoust. Soc. Am. Volume 121, Issue 6, pp. 3790-3801 (June 2007) and may be found at http://dx.doi.org/10.1121/1.2710963

Abstract

This study investigates the effects of speaking condition and auditory feedback on vowel production by postlingually deafened adults. Thirteen cochlear implant users produced repetitions of nine American English vowels prior to implantation, and at one month and one year after implantation. There were three speaking conditions (clear, normal, and fast), and two feedback conditions after implantation (implant processor turned on and off). Ten normal-hearing controls were also recorded once. Vowel contrasts in the formant space (expressed in mels) were larger in the clear than in the fast condition, both for controls and for implant users at all three time samples. Implant users also produced differences in duration between clear and fast conditions that were in the range of those obtained from the controls. In agreement with prior work, the implant users had contrast values lower than did the controls. The implant users' contrasts were larger with hearing on than off and improved from one month to one year postimplant. Because the controls and implant users responded similarly to a change in speaking condition, it is inferred that auditory feedback, although demonstrably important for maintaining normative values of vowel contrasts, is not needed to maintain the distinctiveness of those contrasts in different speaking conditions.

Suggested Citation

Lucie Ménard, Marek Polak, Margaret Denny, Ellen Burton, Harlan Lane, Melanie L. Matthies, Nicole Marrone, Joseph S. Perkell, Mark Tiede, and Jennell Vick. "Interactions of speaking condition and auditory feedback on vowel production in postlingually deaf adults with cochlear implants" Psychology Faculty Publications (2007).
Available at: http://works.bepress.com/hlane/1