My DS7 is a fidgeter, wiggler, and a hummer. He used to moan and groan! He looks like he is in his own world, completely oblivious, yet consistently comes up with the correct response. As long as people talking to him or teaching him understand this, it is ok for now. But it will become less and less acceptable as he moves up. Luckily he has an IEP that allows accommodations for this, but obviously he will lose serious social standing if he is still doing this in grade 7. Nan