Cochlear implantation has been a standard therapy for treating severe deafness because patients who receive it have better speech perception. However, the hearing performance of cochlear implantation in noisy environment is far from satisfaction. Efforts have been made to reverse such condition, such as EAS, bimodal stimulation, environment-adaptive speech enhancement and multipolar stimulation, and patients who receive it get more or less better speech perception in noisy environment than traditional cochlear implantation.
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