Savant

A person can be referred to a savant if they seem to have a peculiar amount of knowledge or skill in a particular area, especially skill that appears to be abnormal for their age (mental or physical). The popular movie "Rainman" was a story about an "Autistic Savant," a man who had all the symptoms of autism yet possessed a fantastic memory for anything he had ever heard or read. A famous musical savant from European history was Mozart, whose knowledge of music was so advanced that he started writing very complex and astounding works for the piano while still a young child.