The authors followed the development course of a language and the cognitive neuropsychological ability in two children with progressive nerve deafness wearing cochlear implants CI , one having worn a CI since 3 years and 6 months old, and the other having worn a CI since 6 years and 11 months old. We obtained the following findings :
In Japan, Cochlear implant surgery began to be performed in 1985. Since then, more than 10,000 patients have received cochlear implant surgery. Cochlear implant is the only means to restore hearing ability in highly hearing-impaired patients that is not enough to hear with the wearing of a hearing aid. In spite of the good results from the point of view of hearing ability, several problems have been reported in the limit of cochlear implant, for example, the speech perception in noisy environments wearing a cochlear implant is difficult. In this paper, the system, the history, current trends, and issues of cochlear implant are explained. We discuss the bilateral, the bimodal, the integrated education of children wearing cochlear implants, and the role of speech therapist in cochlear implant, because especially we are expected the increase of bilateral children by having revised the criteria and indications for cochlear implant surgery in children.
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