The human mind is incredible, the sound of a car in the distance getting slightly muffled by the body now directly in front of you might cue the subconscious mi

The human mind is incredible, the sound of a car in the distance getting slightly muffled by the body now directly in front of you might cue the subconscious mind that something in the scene has changed triggering you to look up. My guess is all the talk of a sixth sense is just tiny cues from the other senses all getting subconsciously analyzed together.