That's probably a better description. At first blush it looks like something you might interpret as skepticism - rocking the head side to side as if to say "Tha

That's probably a better description. At first blush it looks like something you might interpret as skepticism - rocking the head side to side as if to say "That's not quite right." It took me a while to figure out it indicates a positive response to a question like "Does this bus go downtown?" rather than a negative one.