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Is there any evidence beyond anecdotal that systems with ADHD/autistic systems are more likely to be "fictive-heavy" due to having special interests? I've seen that claim floating around tumblr as if its medical fact, and it feels very strangely infantilizing, as if having ADHD/autism makes one inherently more fantasy-prone. Have professionals even written about "fictive-heavy" systems? Most literature I've read mentions fictional introjects in general as, maybe, a footnote at best.
Anon, I feel like you're coming at this from the wrong angle. Being autistic or having ADHD does lend to hyperfixations, including fiction. This is not the same as being fantasy prone, nor does it negate the legitimacy of DID or introjects. MANY aspects of DID/OSDD are still underresearched. Lack of more documentation of fictives in professional literature does not make them any less real or prevalent.
As to whether this is more common in autistic/ADHD systems, I don't know for sure. It's not something I could prove to you with stats; though the logic and reasoning follows.
I don't think it is at ALL infantalizing to note that fictives seem more common in these systems due to hyperfixations on fiction/media. To say so would indicate that fictives in general have a negative connotation or are something to be looked down upon which is simply not true.
Input and discussion on any/all questions is encouraged.