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What's the Difference Between Blindness and a Deaf Child?
If a child is born blind, the part of the brain that we would normally call the visual cortex is no longer visual. Now it's doing other things, doing hearing and touch and so on. If you're born deaf, your auditory cortex s does not get taken over by other functions. Normally a brain is busy sharing the real estate with all these different tasks, but if you're devoting a lot of it to one thing, you can be quite great at it.