Already has to a degree - hyperactive type and inattentive type.
But you've also got to consider personal taste - hyperfixation happens when it's something you're interested in. Someone else might hyperfocus on video games, or trawling ebay, or researching a topic.
I am famous for "ratholing" for hours on some specific thing that caught my interest, usually with little sense of the time that has passed, and almost exclusively on problems that aren't at all what I'm supposed to be focused on at the time
Not a disagreement, more of a yes, and: “interested” may not necessarily be personal interest, and the subject of hyperfocus might not be a personal interest. It can also happen manifest, for example, as obsession with solving some work problem or chore which isn’t appealing at all until begun. Or even some unrelated yak shaving tangent that fits none of these categories.
Yeah, from personal experience I'll happily sit there and hand-lint a file. It's... calming? So I wonder what the right word to use in place of "interest" is. Attention?
I read recently that they're starting to view hyperactive and inattentive as different presentations of the same symptoms/root causes rather than different types ie the same things that make hyperactive ADHD not sit still make inattentive constantly go off on mental tangents.
But you've also got to consider personal taste - hyperfixation happens when it's something you're interested in. Someone else might hyperfocus on video games, or trawling ebay, or researching a topic.