Autistic people seem to have extraordinary skills of remembering and drawing objects in detail from memory. Scientists say in autistic people the brains are organised differently from those of other people; the area at the back of the brain, which processes visual information, is more highly developed. That may be why people with autism can be better than others at carrying out some types of visual tasks. On the contrary, other brain areas are less active which leaves less brain capacity in areas which deal with decision-making and planning.
There was news couple weeks ago about this 12-year-old mildly autistic genius who is now studying at Indiana University-Purdue University. It has been said that also
You can read the whole article from BBC here.