My son does have neurological issues that have caused his processing learning disability.
The brain is plastic, particularly for children. My son has an almost photographic memory, so I feel when we do flashcards, as an example, we are accessing that talent even if we can't per se improve the processing speed part of his brain.
You can't make every child in every area normal, obviously. However, too often I see overlooked the concept that if you work at something, maybe you can improve- okay, you aren't normal in that area, but you are BETTER than you were.