Same difference. According to the way I've learned the process the man gives cabeceo (head movement) in response to the woman's mirada (look). If I don't receive eye contact (mirada) I look to someone else. I don't stop to analyze if I'm being ignored or if she is oblivious. If I'm looking toward her to see if I will receive mirada and she makes eye contact, looks away & does not look back, I look to someone else. There have been times when I've been standing or sitting near someone who has not given me mirada & seen her respond to the outstretched hand which it the typical (non AT) male initiated dance request around here. I may then ask which she prefers & find out that she was oblivious to or uncomfortable with the mirada/cabeceo aspect of the dance, but that doesn't occur very often.