From: Brain research and human science

Learning occurs through change in the strength of connections between neurons and also through neuroplasticity - adding or removing connections between brain cells and adding new cells. Striking evidence of how plastic the brain can be is provided by the case of a 10-year old girl who was born with the right half of her cerebral cortex missing. A study has found that she now sees perfectly because of a massive reorganisation of the brain circuits involved in vision. Normally the right side of the brain processes the left visual field, and vice versa. Brains scans showed in her case that retinal nerves that should normally connect to the right half of her brain have instead carved out processing areas in two parts of the left brain: the thalamus and the visual cortex. [B][H][V]

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