Cortical maps are dynamic, and can change as circumstances alter. Many of us have experienced this, getting a new pair of glasses or a new hearing aid. At first the new glasses or hearing aids seem intolerable, distorting - but within days or hours, our brain adapts to them, and we can make full use of our new new optically or acoustically improved senses. It is similar with the brain's mapping of the body image, which adapts quite rapidly if there are changes in the sensory input or the use of the body.
( Oliver Sacks )
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