Back in 1952, Hans Eysenck started publishing on a personality trait he called psychoticism, that is basically a set of character traits found in highly creative people, but also in people vulnerable to psychosis (schizophrenia, schizoaffective disorder, bipolar disorder) and also in some personality disorders (schizoid, schizotypal). He published a lot on this, and it is one of the scales in the Big Three (which seems to have lost out to the Big Five these days). He did not include autistic people in his research, probably because of how long ago it was (he died in 1997).
Here's his short description of traits found in people high in psychoticism (P):
aggressive; cold; egocentric; impersonal; impulsive; antisocial; unempathic; creative; tough-minded
This may look familiar since it's quite a lot like how people describe the "autistic personality", though most of us would probably rewrite it to look more like: detached, focussed, empathic with people we're close to but not given to sympathy over day-to-day events with people we don't know well; creative; impulsive; antisocial in the "don't bug me I'm busy" sense . . . . And when you rewrite it to look more positive it does look a lot like how most people would describe the creative type (who is not easy to live with when busy creating).
Curebies think autistic people seem high in P because of lack of opportunity to socialize growing up, but aren't, really, and they want to prevent people from becoming socially stunted. Anti-cure types seem to have the opposite opinion, that we're naturally high-P and that that part of us does not need fixing. If autistic people appear to be high-P, is it because we're like that deep down, or is it superficial because of undersocialization, or is it some combination, or does it depend on which subtype (perhaps not yet described) we are?
Also: are all people on the autistic spectrum high-P? Or is there any relationship between autism and personality? Or are autistic people high-P because it's part of the diagnostic criteria, and low-P autists are being diagnosed as something else? Or what?
If I haven't completely lost people yet, I have a copy of the big three on my web site. If people want to take it and report their scores here, go ahead.
big three (EPQ-R)
For my browser (Safari), you can get your scores and then not email the results. I don't know how it will work for other browsers.