I think there needs to be a LOT more research done on the development of special interests. It's a fascinating topic, and it's so puzzling how, across the board, most people with ASDs say that their special interests chose them, rather than them consciously choosing the special interest. It's like, WHY are we seemingly predisposed to being magnetically attracted to certain areas? What makes one Aspie drawn to transportation and another Aspie drawn to video games?
I know that, with special interest areas that developed when I was younger, I have less of an ability to explain why and how the special interest made me fixated. It's just like it was always there and I don't have words to describe it. Later special interests, while they still "choose me," often are connected to one of the broader special interest areas that began in my toddler/preschool years. For instance, my special interest in neuropsychiatry didn't begin until my teens, and anything mental illness-related captivates me today. However, all of this stems from my inherent, indescribable obsession with anatomy/physiology, which has been with me since age 3 or so. And within all of my special interests, no matter when they started, there ALWAYS is a smaller area of even more intense fixation. Like, within my Cedar Point special interest, my main focus is the Magnum XL-200. And within neuropsychiatry, it's bipolar-I psychotic mania. With I Love Lucy, it's very obscure, underrated parts of episodes nobody considers as "classic." All of these special interests within special interests have this bubbly, joyful, idealized quality whenever I think of them.
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Helinger: Now, what do you see, John?
Nash: Recognition...
Helinger: Well, try seeing accomplishment!
Nash: Is there a difference?