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Journal of Speech, Language, and Hearing Research Vol.45 1039-1054 October 2002. doi:10.1044/1092-4388(2002/084)
© American Speech-Language-Hearing Association
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Phoneme Recognition and Confusions With Multichannel Cochlear Implants

Vowels

Taina T. Välimaa 1
Taisto K. Määttä 1
Heikki J. Löppönen 2

Martti J. Sorri 2
1 Department of Finnish, Saami and Logopedics University of Oulu Oulu, Finland
2 Department of Otorhinolaryngology Oulu University Hospital University of Oulu Oulu, Finland

taina.valimaa{at}oulu.fi

The aim of this study was to investigate how postlingually severely or profoundly hearing-impaired adults relearn to recognize vowels after receiving multichannel cochlear implants. Vowel 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. The responses were coded for phoneme errors, and 95% confidence intervals for recognition and confusions were calculated. The average vowel recognition was 68% (95% confidence interval = 66–70%) 6 months after switch-on and 80% (95% confidence interval = 78–82%) 24 months after switch-on. The vowels [æ], [u], [i], [o], and [a] were the easiest to recognize, and the vowels [y], [e], and [ø] were the most difficult. In conclusion, adaptation to electrical hearing using a multichannel cochlear implant was achieved well; but for at least 2 years, given two vowels with either F1 or F2 at roughly the same frequencies, confusions were drawn more towards the closest vowel with the next highest F1 or F2.

KEY WORDS: cochlear implant, nonsense syllable test, speech recognition, postlingual profound hearing impairment, vowel recognition, vowel confusions

Submitted on June 15, 2001
Accepted on March 19, 2002






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