In social relationships-whether between mates, parents and offspring, or friends-we find much of life's meaning. But in these relationships, so critical to our well-being, might we also detect the workings, even directives, of biology? This book, a rare melding of human and animal research and theoretical and empirical science, ventures into the most interesting realms of behavioral biology to examine the intimate role of endocrinology in social relationships. The importance of hormones to reproductive behavior-from breeding cycles to male sexual display-is well known. What this book considers is the increasing evidence that hormones are just as important to social behavior. Peter Ellison and Peter Gray include the latest findings-both practical and theoretical-on the hormonal component of both casual interactions and fundamental bonds. The contributors, senior scholars and rising scientists whose work is shaping the field, go beyond the proximate mechanics of neuroendocrine physiology to integrate behavioral endocrinology with areas such as reproductive ecology and life history theory. Ranging broadly across taxa, from birds and rodents to primates, the volume pays particular attention to human endocrinology and social relationships, a focus largely missing from most works of behavioral endocrinology.

Scientists from different disciplines, including anthropology, psychology, psychiatry, pediatrics, neurobiology, endocrinology, and molecular biology, explore the concepts of attachment and bonding from varying scientific perspectives. Attachment and bonding are evolved processes; the mechanisms that permit the development of selective social bonds are assumed to be very ancient, based on neural circuitry rooted deep in mammalian evolution, but the nature and timing of these processes and their ultimate and proximate causes are only beginning to be understood. In this Dahlem Workshop Report, scientists from different disciplines-including anthropology, psychology, psychiatry, and behavioral biology-come together to explore the concepts of attachment and bonding from diverse perspectives. In their studies they seek to understand the causes or the consequences of attachment and bonding in general and their different qualities in individual development in particular. They address such questions as biobehavioral processes in attachment and bonding; early social attachment and its influences on later patterns of behavior; bonding later in life; and adaptive and maladaptive (or pathological) outcomes. The studies confirm that social bonds have consequences for virtually all aspects of behavior and may be protective in the face of both physical and emotional challenges.