autism

Because of the organizing aspect of the senses of individuals along the autistic spectrum they do not necessarily appear tuned in at certain times when in reality they are completely listening and absorbing what is going on.  Do not assume as a caretaker that because they appear spaced out that therefore they are not listening and absorbing information that you might not want them to hear.

I have read that many autistic adults find it difficult to look at someone and have a conversation with them at the same time.  Some actually are so bothered by visual stimulation in general that they find dark glasses useful.  There are even special lenses that are an amber color that are supposed to help with visual disturbances.