Phoneme Recognition and Confusions With Multichannel Cochlear Implants Consonants Research Article
Research Article  |   October 01, 2002
Phoneme Recognition and Confusions With Multichannel Cochlear Implants
 
Author Affiliations & Notes
  • Taina T. Välimaa
    Department of Finnish, Saami and Logopedics University of Oulu Oulu, Finland
  • Taisto K. Määttä
    Department of Finnish, Saami and Logopedics University of Oulu Oulu, Finland
  • Heikki J. Löppönen
    Department of Otorhinolaryngology Oulu University Hospital University of Oulu Oulu, Finland
  • Martti J. Sorri
    Department of Otorhinolaryngology Oulu University Hospital University of Oulu Oulu, Finland
  • Contact author: Taina T. Välimaa, H M.A., Department of Finnish, Saami and Logopedics, P.O. Box 1000, FIN-90014, University of Oulu, Finland. E-mail: taina.valimaa@oulu.fi
Article Information
Hearing Aids, Cochlear Implants & Assistive Technology / Speech, Voice & Prosody / Hearing / Research Articles
Research Article   |   October 01, 2002
Phoneme Recognition and Confusions With Multichannel Cochlear Implants
Journal of Speech, Language, and Hearing Research, October 2002, Vol. 45, 1055-1069. doi:10.1044/1092-4388(2002/085)
History: Received September 19, 2001 , Accepted March 19, 2002
 
Journal of Speech, Language, and Hearing Research, October 2002, Vol. 45, 1055-1069. doi:10.1044/1092-4388(2002/085)
History: Received September 19, 2001; Accepted March 19, 2002
Web of Science® Times Cited: 13

The aim of this study was to investigate how postlingually severely or profoundly hearing-impaired adults relearn to recognize consonants after receiving multichannel cochlear implants. Consonant recognition of 19 Finnish-speaking subjects was studied for a minimum of 6 months and a maximum of 24 months using an open-set nonsense-syllable test in a prospective repeated-measure design. Responses were coded for phoneme errors, and proportions of correct responses and 95% confidence intervals were calculated for recognition and confusions. Two years after the switch-on, the mean recognition of consonants was 71% (95% confidence interval = 68–73%). The manner of articulation was easier to classify than the place of articulation, and the consonants [s], [r], [k], [t], [p], [n], and [j] were easier to recognize than [h], [m], [l], and [υ]. Adaptation to electrical hearing with a multichannel cochlear implant was successful, but consonants with alveolar, palatal, or velar transitions (high F2) were better recognized than consonants with labial transitions (low F2). The locus of the F2 transitions of the consonants with better recognition was at the frequencies 1.5–2 kHz, whereas the locus of the F2 transitions of the consonants with poorer recognition was at 1.2–1.4 kHz. A tendency to confuse consonants with the closest consonant with higher F2 transition was also noted.

Acknowledgments
We wish to express our warmest gratitude to the personnel of the Hearing Centre of the Oulu University Hospital for their cooperation in the collection of the data. We also thank Professor Matti Lehtihalmes, Department of Finnish, Saami and Logopedics, University of Oulu, for helpful comments on this manuscript and Mr. Arto Muhli, Computer Services Centre, University of Oulu, for valuable advice in planning the statistical analyses. The present study was supported by grants awarded to the first author by the Finnish Cultural Foundation, by the Department of Finnish, Saami and Logopedics at the University of Oulu, and by the Oulu University Scholarship Foundation.
Order a Subscription
Pay Per View
Entire Journal of Speech, Language, and Hearing Research content & archive
24-hour access
This Article
24-hour access