According to my research on specific anomalies among people diagnosed with autism spectrum disorder the one that is described in the question is called "Savant Syndrome". This is a condition which affects people with different mental disabilities in which they show abilities far more developed than the regular person. These abilities or skills are usually based on memory.
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Corbin is an 18 year old that has autism spectrum disorder. It is hard for him to speak, but he can draw specific things that are rare to him or have only been viewed by him once in his life. Savant Syndrome is a condition is which someone who has been diagnosed with autism or another disability is able to do a behavior that is outstanding. Therefore, Corbin has Savant Syndrome.