Slashdot | Scientific Brain Linked to Autism: "It is far more than lying and bullshitting. In a social situation, most people can talk naturally. They simply say what comes to mind. For someone with autism, they have little to no intuation. They literally have no concept of what to say or do. If it is severe enough, the only way they can perform in social situations is to observe how others act and react and mimic them when they are in similar situations. This is much more analytical than intuitive to do. If they can't choose a reaction they can't create one on the fly and will just freeze and say very little ('ah, i see') or nothing at all.
They also generally have a difficult time understanding and picking up on more subtle forms of communication. They only hear the words. They don't hear the emotion or inflection or notice the facial expressions, and they have a difficult time reading (or listening as it were) between the lines. Furthermore, they have a difficult time extrapolating the thoughts and feelings of another person. They can't 'put themselves in the other person's shoes.' Basically, if something isn't said, it doesn't exist to them. That is a crippling disadvantage in social situations."