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.

In more ways than we may sometimes care to acknowledge, the human being is just another primate--it is certainly only very rarely that researchers into cognition, emotion, personality, and behavior in our species and in other primates come together to compare notes and share insights. This book, one of the few comprehensive attempts at integrating behavioral research into human and nonhuman primates, does precisely that--and in doing so, offers a clear, in-depth look at the mutually enlightening work being done in psychology and primatology.

Relying on theories of behavior derived from psychology rather than ecology or biological anthropology, the authors, internationally known experts in primatology and psychology, focus primarily on social processes in areas including aggression, conflict resolution, sexuality, attachment, parenting, social development and affiliation, cognitive development, social cognition, personality, emotions, vocal and nonvocal communication, cognitive neuroscience, and psychopathology. They show nonhuman primates to be far more complex, cognitively and emotionally, than was once supposed, with provocative implications for our understanding of supposedly unique human characteristics. Arguing that both human and nonhuman primates are distinctive for their wide range of context-sensitive behaviors, their work makes a powerful case for the future integration of human and primate behavioral research.