Mechanisms of vowel recognition for ineraid patients fit with continuous interleaved sampling processors

Michael Dorman, Philipos C. Loizou

    Research output: Contribution to journalArticlepeer-review

    13 Scopus citations


    Vowel recognition was assessed for eight, cochlear implant patients who use the Ineraid's six-electrode array. Recognition was tested in three conditions: with the Ineraid after years of experience; with a CIS processor at fitting of the processor; and with the CIS processor after 1 month's experience. At the time of fitting of the CIS processor, vowel recognition was not superior to that with the Ineraid. Recognition improved significantly over the period of a month. At 1 month, performance was significantly better with the CIS processor than with the Ineraid. This outcome is interpreted to mean that ramapping of the vowel space is necessary following fitting with the CIS processor and some of the remapping occurs over a time period of days or weeks, rather than hours. Vowel errors at one month could be accounted for by two mechanisms. One is that patients attended to low-frequency channels at the expense of high-frequency channels, or could not use information in high- frequency channels. The second is that, for diphthongs, patients could not detect frequency change over the course of the utterance.

    Original languageEnglish (US)
    Pages (from-to)581-587
    Number of pages7
    JournalJournal of the Acoustical Society of America
    Issue number1
    StatePublished - Jul 1997

    ASJC Scopus subject areas

    • Arts and Humanities (miscellaneous)
    • Acoustics and Ultrasonics


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