Electrode position, repetition rate, and speech perception by early-and-late-deafened cochlear implant patients
AuthorBusby, P. A.; Tong, Y. C.; Clark, Graeme M.
Source TitleJournal of the American Academy of Audiology
Document TypeJournal Article
CitationsBusby, P. A., Tong, Y. C., & Clark, G. M. (1993). Electrode position, repetition rate, and speech perception by early-and-late-deafened cochlear implant patients. Journal of the American Academy of Audiology, February, 93(2), 1058-1067.
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Psychophysical and speech perception studies were conducted on eight patients using the 22electrode cochlear implant manufactured by Cochlear Pty. Ltd. Four early-deafened patients became deafened at 1-3 years of age and were implanted at 5-14 years of age. Four late-deafened (postlingual adult) patients became deafened at 38-47 years of age and were implanted at 42-68 years of age. Psychophysical studies measured the discrimination of trajectories with time-varying electrode positions and repetition rates. Speech perception studies measured performance using two speech coding strategies: a multi-electrode strategy which coded the first and second formant frequencies, the amplitudes of the two formants, and the fundamental frequency; and a single-electrode strategy which coded the amplitudes of the first and second formants, and the fundamental frequency. In general, the four late-deafened patients and one early-deafened patient were more successful than the other three early-deafened patients in the discrimination of electrode position trajectories and in speech perception using the multi-electrode strategy. Three of the four late-deafened patients were more successful than the early-deafened patients in the discrimination of repetition rate trajectories. Speech perception performance in the single-electrode strategy was closely related to performance in repetition rate discrimination. The improvement in speech perception performance from the single-electrode to multi-electrode strategy was consistent with successful performance in electrode discrimination.
Keywordsotology; otolaryngology; speech perception; cochlear implants; single-electrode; multi-electrode
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- Graeme Clark Collection