when theres a link from the newsroom on tv to a reporter ,why do they keep nodding until the newsreader has stopped talking and they then stop nodding and answer the question???
its a good technique to use on the radio that is born of good technique. in an interview situation, you nod instead of actually saying yes, good, ok etc as it often sounds patronising. most tv people start in radio so it follows that that is why they do it.