I'm not sure if describing what the blip feels like would help without going through the process of discovery, but I'll have a go anyway: it's noticing that you have a thought in your head without remembering the process you got through to reach it. When there's a new thought formed that's within easy mental grasp distance, especially when it's a judgement of a person or an emotion e.g. attraction, and the reason for it is not within an easy grasp distance, then that's a sign for me that it's an unconscious conclusion.

Basically if a new thought that feels "near" appears, but when I ask myself why, the answer feels "far", that's a sign that if I did retrieve the answer it would be a rationalisation rather than the actual explanation, and I attempt to abort the retrieval process (or at least proceed with many mental warning signs).