Is asking previuously answered questions communicative subtext?
1) “Subtext: 1. an underlying theme in a piece of writing 2. a message which is not stated directly but can be inferred” Source and further information: http://www.thefreedictionary.com/subtext 2) If we use here the second meaning, someone who would ask previously answered question could in some cases consciously give the message that they did not understand the answer. Or it would be a tactic to annoy the answerer. But it could also just be the result of poor concentration, for instance.