Abstract
The delay in mental development is common in children. In combination with deafblood are one of the five most common causes of developmental abnormalities. Both parameters have a pronounced effect on the development of the child. Features of perception of sound, its carrying out, brain work form speech in children. It was revealed that audio scoring systems are not enough for hearing control, it is necessary to allocate children with risk factors and their combination. Cochlear implantation gives a significant influence on the development of higher nervous activity through perestroika, especially successful in sensitive periods.
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