Before I start, I would just like to say that I know I could've posted this in the Asperger/Autism forum. But I wanted to start fresh, because this is something I wanted to communicate and have a new, thoughtful discussion about.
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Lately, I have been working on a correlation between Asperger Syndrome and the INTJ type. Many sources acknowledge this correlation, but I'm going to attempt to bring some light into it.
I think that an INTJ is more likely to appear literal in his/her thinking to the observer. This is often a symptom of autistic disorders, but symptoms are based on observations rather than an actual understanding of the patient's inner workings.
But since Intuition is Introverted, the person is more likely to brood upon the meaning of things rather than understand it immediately. This could also be the source of daydreaming tendencies. Their inferior function is Extraverted Sensing, so they will probably collect the details in their environment and then store them for interpretation later via Ni, which will probably be done alone and likely unknown to others.
An Extraverted Thinking function could be related to an autistic's tendency to line up their toys. I have experience with this, but I found that such repetitious behavior helps me zone out into my Ni.
On the other hand, an ISTJ has an easier access to Extraverted Intuition (the INTJ doesn't reach Ne until the shadow functions), which interprets meanings in the here-and-now. And since it's inferior, it will take a common sense approach, making the ISTJ more adept at social conversation.
The xSTJ type is said to be more socially acceptable (especially in males), which means that they should be adept at understanding social cues -- the meaning of someone's words. And they can in a level that is basic and quick.
The reason I write this is because I notice a lot of sites that claim autistics are believed to lack imagination and introspection, but at the same time, it is bewildering that a lot of brilliant artists and scientists are now believed to have autistic-like disorders -- many of whom are considered to be of the NT temperament.
I think the labeling of social disabilities is simply labeling of a personality difference. The SJ type is considered to be the "most normal," and the SJ types are probably the ones more likely to jump to conclusions (via their weaker Extraverted Intuition) and say that their children "has a problem." Children who are diagnosed with ADHD are becoming more common, and it is becoming clear that this is simply related to the entire SP temperament.
Also, ADD (without Hyperactivity), I think, could in fact be related to Extraverted Intuition in the same way I think AS and HFA (high-functioning autism) is related to Introverted Intuition. The difference is that Extraverted Intuition is more scattered and finds it more difficult to focus on one topic, while Introverted Intuition tends to obsess about matters.