The torso is the largest segment of the human body and contains the most vital organs: the heart, lungs, liver, and the major blood vessels. Because it houses the organs whose damage is most immediately life-threatening, the torso is the body part most aggressively protected by the limbic system in situations of perceived threat. This protective instinct is not metaphorical. It is a literal, automatic physical response that happens below conscious awareness and produces behavioral outputs that reveal how safe or threatened a person feels at any given moment. What makes torso behavior so rich as a reading signal is...