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An autistic savant (historically described as idiot savant) is a person with both autism and savant syndrome. Savant syndrome describes a person having a severe developmental or mental handicap with extraordinary mental abilities not found in most people. This means a lower than average general intelligence (IQ) but very high narrow intelligence in one or more fields. Savant syndrome skills involve striking feats of memory and arithmetic calculation and sometimes include unusual abilities in art or music. Savant syndrome is sometimes abbreviated as "savantism", and individuals with the syndrome are often nicknamed savants. This can be a source of confusion since a savanter is a person of learning, especially one of great knowledge in a particular subject. *wikipedia

Watch "The Boy With The Incredible Brain", a British documentary on the boy savant.