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Can all deaf people hear if they use hearing aid?

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One of the important findings of the last two decades was that there are critical periods in the development of the nervous system for the sensory cortex such that kittens that have their eyes sutured closed will not develop normal vision. A similar critical window also exists for people born deaf. If they are never exposed to normal speech by an early age, then even with a hearing aid they will be unable to comprehend speech.

However, if the deafness is caught at an early age, one can have a cochlear implant surgery done, which enables to hear, adding a lot of speech therapy, a child can reach 100% speech development.
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