Maybe thats why we only use about 10% of the white 'tofu' in our skull.
Doctors found Terry Wallis's brain is constantly healing itself, meaning they are forming new path way to repair the damaged function of the brain. Terry has ragains some of his limbs function and is showing sign of improvement. (Link)
Many doctors agree that this is a very rare case, but some said that futures doctor would be force to see patients in a long term coma differently.