My younger son has Autistic Spectrum Disorder - ASD - i.e. he has autism. Not Asperger's, which is the condition described in the book, but nonetheless, he is a high-functioning autist. Not in the sense of Dutin Hoffman in Rainman, but he diverges from the neurotypical in certain key aspects. Some are engaging and thought provoking, some are infuriating.
Although he is nine, and for two years up to last year was an academic year ahead of his peers (there was no space for him in his year group, and when a space became available, we decided it would be best to repeat Yr5 so he had more time to develop socially before entering secondary school), he often behaves as a three year old would. I'm only on the net right now because, when I went upstairs to bed, he was tucked in, and there was no room for me!
My son's interests are a little different from the rest of his class, and he likes to play with Yu-Gi-Oh cards, which the other boys passed through a year ago.
He likes to know about things in detail. He gets intensely involved in anything he watches or plays. I have had to learn the characters and stories from Beyblade, Digimon, Pokemon, Yu-Gi-Oh, Harry Potter and Star Wars. He's a bit like an encyclopaedia on all of these. He is interested in the detail of the monsters, their attacks, combinations, powers, etc.
Oh - I should point out this is an area where he is typically autistic (memorising facts) and absolutely untypical (he does not just act out scenes he has watched, but makes up his own battles, monsters, etc - indicating a creative imagination not common among autists).
I could ramble on about this al night, but don't let me bore you.
Il Sotto Seme La Neva