Scent

The nose is the most direct path to our memory. A mere whiff of a once familiar scent can instantly transport us back to an exact moment or experience we had otherwise forgotten. The subconscious processing of scent should not be underestimated. The scent of another person may predispose us to befriend or distrust them, depending upon past experience with similar scents. This is the most animalistic and basic of our senses, and most of us have lost touch with it.