There seems to be a correlation. Which doesn't mean there can't aspie extroverts, but they seem to be rarer.
This data is from an
austism subforum (asperger is an autism variation):
Most are INTJs. More than 60% INTs and only 2/91 ENFPs! Even though the sample isn't conclusive, this should be significant.
A few points:
1) This poll is hardly scientific. It's on a forum and relies on too small of a sample, as you can see from the total of 91 votes.
2) Most people are poorly acquainted with the MBTI, and most people probably really don't know their own type. Every time my friends bring up the MBTI they remember themselves being something they're not. My INTJ cousin has thrown out ENTJ and ESTJ, my ENTJ friend has thrown out ESTJ and INTJ. Most people just don't know/remember/care.
3) A little something called
confirmation bias comes into play here. On forums like Something Awful and imageboards like 4chan you find a great number of socially retarded persons who claim to have asperger's syndrome just to be able to say "see! I'm normal!" and have never gotten a formal diagnosis. I'd assume a high number of these (25% or more) to be cases of people who believe themselves to be sufferers of asperger's syndrome.
I have asperger's syndrome, diagnosed independently on at least three occasions. I'm not socially retarded. I'm 'different', no doubt about it, and there is a significant intelligence increase over other INTs (mostly INTJs), and I do think asperger's comes into play. There is literally no time I'm awake that I'm not exploring everything possible or absorbing knowledge. That's most likely due to asperger's syndrome. I'm suggesting that because while INTPs I know seem to be constantly thinking, they're not hyper-obsessive about it like I am and don't get totally immersed in explorations of large ideas for months and months at a time.
The exception being a couple of INTPs I know with asperger's syndrome.
Also, I hate INTJs. That doesn't really relate to anything, but I'm smarter than all of you.
