Some researcher once came up with the idea that those with Asperger's have an attention deficit in everything but their special interest and everything out of their routines.
But they're able to concentrate on their special interest if not disturbed by outside stimuli. If they're on their own, this theory said, and comfortable, they can easily concentrate and work on what interests them.
People like this would have an attebntion deficit, but not AD(H)D.
And distraction by concentration/fascination about something else is not anything like the core symptoms of AD(H)D either.
So if a person with AS would be busy thinking about... trains (whatever) while they cross the street and thus miss it's not like AD(H)D. If someone concentrates on a topic and thus does not notice something else, they're actually showing how they are able of paying attention, just to the wrong things.
AD(H)D would be... 'oh, look, a blue car... and there's a woman in pink walking over there... oh, it's not green yet, no... ahhhh, I love that car... wait, I wanted the cross the street! I should be walking, so I'm going to walk... woooah, A CAR HELP'.
Yeah, that's what happens to me all the time hehe
I plan to concentrate on the bloody traffic, but I immediately am distracted and again distracted and yet again distracted. If I#d be distracted by a most fascinating car that would be my special interested and if I'd spent minutes being fascinated by that car and forgetting to cross the street, then it would be AS and not AD(H)D. If I saw the car, would be fascinated... and distracted because there's chewing gum on the floor, it would be AD(H)D that made it happen and not AS.
And the theory said that people with AD(H)D do of course have hyperfocus and are of course not incapable of being able to concentrate at all.
But their attention deficit and impulse control deficit is different from that of those with AS in that they cannot concentrate on an what interests them when they want. They just can't control it. Their focus can't upheld for a long time, because they actually have generally impaired attention ability.
It's like... they manage to pay attention for a few minutes because they might think it's real interesting, but after a few minutes they just can't any more even though they really want to focus further.
I think this idea about attention deficits in AS and AD(H)D actually fits.
Well, it fits me, which is not saying much seeing how I'm just 1 person.
Edit: Yeah, I'd say the attention deficits as described above differ significantly. Not so much in their result, because in both scenarios a person is at risk to get run over by a car. But what got them there in the first place was quite different.
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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