A revised edition of the bestselling book on how relationships build our brains. As human beings, we cherish our individuality yet we know that we live in constant relationship to others, and that other people play a significant part in regulating our emotional and social behavior. Although this interdependence is a reality of our existence, we are just beginning to understand that we have evolved as social creatures with interwoven brains and biologies. The human brain itself is a social organ and to truly understand being human, we must understand not only how we as whole people exist with others, but how our brains, themselves, exist in relationship to other brains. The first edition of this book tackled these important questions of interpersonal neurobiology-that the brain is a social organ built through experience-using poignant case examples from the author's years of clinical experience. Elegant explanations of social neuroscience wove together emerging findings from the research literature to bring neuroscience to the stories of our lives.