Asperger's is a section along the range of issues they call the Autistic Spectrum. It is not as clear cut and as diagnosable as something like a cut in the hand. Many of the ways Asperger's presents can be confused with things from Downe Syndrome up to Attention Deficit Disorder (ADD). The reality is the whole Autistic Spectrum represents a range of issues related to something being hardwired in the brain different to what the current medical people call normal. Thus there is usually little or nothing that can be done to treat it.
What you say is true, but ...
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Asperger's is a long ways from the other forms of Autism. While the symptoms vary, most people with Asperger's can learn to function normally (so few people suspect they have a mental health disorder), though it fairly easy to spot (to those familiar with it): intense focus, an inability to pick up on subtle social cues, poor social behavior and very high productivity.
As a result, many high tech business tend to favor hiring people with Asperger's, although like many with a variety of mental health issues, they tend to favor the arts, in one form or another.
I make a great example. After majoring in Economics in college, I talked my way into a computer job because by being highly productive, I could make my own rules (i.e. they'd make exceptions for my sometimes erratic behavior). My lack of social skills kept me from being promoted beyond a certain level, but I functioned very well in the business world.
From what I've been able to pick up, many authors both here and elsewhere have Asperger's and other mental health issues. Many of these conditions tend to be found in the same people.
But the long of short of this is that the people of Asperger's aren't easily lumped into the whole Autistic spectrum because the are so high functioning. This is a sore point with those with Asperger's, and something that those in the Autistic community refuse to admit because those with Asperger's raise their social standing, but their issues are vastly different. Combining them into a single treatment pool means poor treatment options for them.
In general, while Asperger's victims suffer as children, they generally 'learn' how to adapt in their late-teen/early college years (the same time their peers come down with Schizophrenia). After that, most find jobs which give them enough leeway to get by (like I did). Unfortunately, in their later years (around their 50s and 60s) their conditions tend to worsen and their coping mechanisms tend to fail, leaving them largely unable to work in most environments. That's when many of us in the tech industry switch over to writing: we hopefully earned enough to keep our heads above water and need something to do because we're so dedicated, but largely can't hold normal jobs.
While it's believed both Asperger's and Autism is caused by the same thing (now believed to be some sort of immune disorder in the brain), they're normally diagnosed at different ages, indicating it doesn't occur at the same development stage--though that can't be definitely established due to lack of symptoms.
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