MRC_Hans said:Btw, does somebody know: Isnt there a lot of difference between an autistic type behavior and actually being autist.
Autism is actually a whole continuum. My autistic son does a lot of things that are considered to be things that autistic children don't do: he'll look you in the eye, spontaneously give you a hug and say he loves you, and so on.
Basically, there are a whole bunch of "autistic tendencies" that everyone has to a degree. You don't need all of them to be autistic, you just need enough of them at a severe enough level to result in a developmental delay.
Further, some kinds of autism appear to go away at puberty. Thankfully, they think my son's kind is one of these.
As for what causes all of this, nobody really knows. It seems like every time they come out with a study showing a correlation between autism and a particular vaccine, or a certain diet the pregnant mother was on, or something like that, the next year another study comes around and refutes it.