Thanks, rls. I finally understand the difference. It's unfortunate that a lot of folks go around "diagnosing" other people's children but they do. So many people have called my son an aspie but when I read the symptoms, I just don't see it and the doctors agree. He is painfully shy and when he sees new people, the poor dear does something I call "the chicken". Mouth open wide, elbows back and hands down. The hands used to flap. Later, he'll say, "I hate when I meet new people and my body goes like this." He can't help it, though! Does anyone know why he does that?