I might never wrap my head around what an obsession is.
Forgetting to eat about pursuing an interest? No.
Resisting to be interested in something else of reason and importance? No.
Doing nothing but what I am interested in? Well, yes, but I'm interested in and motivated for whatever I consider advantageous and I am naturally resistant towards types of authority trying to play their illusion of power.
Not going to sleep early enough because I am so engrossed in an awesome book? Sure. I will have to set myself a deadline and I will keep to it. Unless something outrageous happens and I will have to keep reading until my eyes water from reading and my hands tire from holding the book.
That's no different from how non-autistic people my age pursue their interests as well.
So, I will assume that I do not have a special interest.
Instead, I meet all the other criteria listed under repetitive behaviours. Stims and routines/trouble with the unexpected, this "persistent occupation with parts of objects" although I'd say it's less an intentional preoccupation but a hint at sensory processing issues. I don't have much love for shoes that I'd intentionally stare at the sole and pay attention to it but I can't help but notice, these detail jumps at me, I can't not-notice and consider the pattern on it pretty (if it is) even if I tried.
Oddly, during my first diagnostic process for AS, the special interest was the most important thing and they kept looking for it. I was also still quite oblivious of what routines and stims really are and their brief description made it all sound pointless and idiotic and nothing like they really are. Even hand-flapping sounded nothing like hand-flapping, so of course I agreed that I did not do something as what they asked me about.
I don't know how to answer whether I am mild or not.
Mild compared to what is often considered mild on WP - maybe not so much.
Mild as defined by ASD specialists I deal(t) with - I am mild or more preferably, as that's what those people say to my face about what they think I must be, "utmost high-functioning".
Maybe it helps more if I refer to what the person who knows me quite best from the outside said once, hardly a year ago. That my disability means that I need supervision/surveillance in normal matters of everyday life well beyond of what's typical for someone my age.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett