Electrode position, repetition rate, and speech perception by early- and late-deafened cochlear implant patients

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Abstract
Psychophysical and speech perception studies were conducted on eight patients using the 22‐electrode 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.

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