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ABSTRACT performance was observed for NH and CI listeners, suggesting that the loss of spectral information was the primary cause of the effects. The Speech Intelligibility Previous experiments have demonstrated that the correct tonotopic representation of spectral information Index was able to account for both NH and CI listeners’ results. No significant differences were observed isimportantforspeechrecognition. However, inprosthetic devices, such as hearing aids and cochlear amongthefourconditionsthatredistributedthespectral information around the hole, suggesting that implants, there may be a frequency/place mismatch due in part to the signal processing of the device and rerouting spectral information around a hole was no better than simply dropping it. in part to the pathology that caused the hearing loss. Local regions of damaged neurons may create a “hole” Keywords: cochlear implant, deafness …