If you're observing verbal and motor tics, you might look into Tourette's and other tic disorders (
http://www.tsa-usa.org/). You'll need a neurologist for this.
Do the tics increase/decrease depending on his emotional state/anxiety? Does he seem anxious at all in general? Has he always had difficulty paying attention to mundane directions or tasks? How is his joint attention (attending to something that someone else is attending to at the same time, usually for the purpose of common understanding of something)? Does he have difficulties with "reading" social situations, or social awkwardness? How is he with changes to routine? Does he have rigidity or special rituals?
