The relationship between speech perception and electrode discrimination in cochlear implantees

摘要: Speech Intelligibility Index (SII) procedures were used to measure the amount of speech information perceived in five frequency bands (170-570, 570-1170, 1170-1768, 1768-2680, and 2680-5744 Hz) by 15 users Cochlear Ltd. CI-22M implant Spectra-22/SPEAK processor. The was compared that normal-hearing listeners. ability these subjects discriminate between stimulation on adjacent electrodes corresponding each band also investigated, using a 4IFC procedure with random current level variations 0% 60% dynamic range. Relative listeners, was, average, significantly more reduced four regions 170 2680 Hz than region Hz. There significant correlation electrode discrimination (when variation encompassed 20% or range) no such Hz, regardless extent variation. These results indicate low medium frequencies is difficult for implantees perceive, this difficulty correlated discriminating place presence loudness variations, fine spectral may be relatively important vowel-formant higher regions.