Biology of human bonding

Human bonding is the process by which close, enduring interpersonal relationships develop between two or more people. These selective and long-lasting attachments—which include parent-child bonds, romantic pair bonds, and friendships—are fundamental to human survival, development, and well-being. Modern neurobiology views bonding not just as a psychological experience, but also as a set of motivational and emotional states rooted in ancient, conserved mammalian brain systems.