“It was thought that decisions were made by the logic-front of the brain, while emotions were controlled by the feeling-back of the brain, the part deeper and closer to the heart. In their culture, it was the responsibility of the party still thinking with the logic brain to rebuke those overtaken by emotion, who intended to start silly arguments or cause harm to others. The logical person would bring shame and reason to their friend by striking the front of the head, and thus increasing blood flow to the area. The science of the practice was murky, but at its core, it was customary practice to smack someone who seemed in need of a good smack.”
Book:The Paragon