Abstract
The mechanism of speech perception in patients with a multichannel cochlear implant was investigated by administering vowel, consonant, and speech recognition tests, and comparing sound spectrograms with the activities recorded from the cochlear implant electrodes. Vowel recognition was found to be adequate, but consonant recognition was poor. Although the cochlear hair cells of such patients are known to be functionally damaged, the cochlear nerve was found to have the capacity to characterize frequency. The signals from the implanted device were very simple compared with those from the normal cochlea; however, the patients could nevertheless understand speech well after cochlear implantation.
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