Efficacy of the Discreteness of Voicing Category (DOVC) Measure for Characterizing Voicing Errors in Children With Cochlear Implants: A Report Purpose This investigation explored the utility of an acoustic measure, called the discreteness of voicing category (DOVC), in identifying voicing errors in stop consonants produced by children with cochlear implants. Another objective was to examine the perceptual relevance of the DOVC measure and 2 commonly used voice onset time (VOT)-based ... Research Article
Research Article  |   June 01, 2008
Efficacy of the Discreteness of Voicing Category (DOVC) Measure for Characterizing Voicing Errors in Children With Cochlear Implants: A Report
 
Author Affiliations & Notes
  • Sneha V. Bharadwaj
    Callier Center, University of Texas at Dallas
  • Amanda G. Graves
    Callier Center, University of Texas at Dallas
  • Contact author: Sneha V. Bharadwaj, Callier Center, University of Texas at Dallas, 811 Synergy Park Boulevard, Richardson, TX 75080. E-mail: snehab@utdallas.edu.
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Speech, Voice & Prosody / Speech / Research Articles
Research Article   |   June 01, 2008
Efficacy of the Discreteness of Voicing Category (DOVC) Measure for Characterizing Voicing Errors in Children With Cochlear Implants: A Report
Journal of Speech, Language, and Hearing Research, June 2008, Vol. 51, 629-635. doi:10.1044/1092-4388(2008/045)
History: Received April 12, 2006 , Revised December 14, 2006 , Accepted September 17, 2007
 
Journal of Speech, Language, and Hearing Research, June 2008, Vol. 51, 629-635. doi:10.1044/1092-4388(2008/045)
History: Received April 12, 2006; Revised December 14, 2006; Accepted September 17, 2007
Web of Science® Times Cited: 3

Purpose This investigation explored the utility of an acoustic measure, called the discreteness of voicing category (DOVC), in identifying voicing errors in stop consonants produced by children with cochlear implants. Another objective was to examine the perceptual relevance of the DOVC measure and 2 commonly used voice onset time (VOT)-based measures, namely, mean VOT and ΔVOT (e.g., VOT /Image Not Available/ − VOT /Image Not Available/).

Method Phonetic transcription and acoustic analyses were carried out on syllable–initial /Image Not Available/ and /Image Not Available/ produced by 10 children with cochlear implants. The DOVC was calculated as the difference between the shortest VOT value of a voiceless stop and the longest VOT value of a voiced stop across several productions of each.

Results Phonetic transcription revealed that 4 of the 10 talkers demonstrated atypical voicing distinctions. Acoustic analyses indicated that the DOVC measure identified these same 4 talkers as producing atypical values, whereas mean VOT and ΔVOT identified a different set of talkers as demonstrating values outside the normal ranges.

Conclusion Preliminary findings suggest that the DOVC measure corresponded with perceptual data better than the other acoustic measures examined in the present study. Data indicate that the DOVC measure may provide perceptually relevant information concerning the production of voicing distinctions.

Acknowledgments
This work was supported by National Institute on Deafness and Other Communication Disorders Grant R03DC007052 awarded to the first author. The authors would like to thank participants and their families for their contributions. Thanks to Deborah Rekart and Anupama Jayaraman for their help in phonetic transcription work. Thanks also to William F. Katz and Raksha Anand for their helpful comments on an earlier version of this article.
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