Part 1 The evolutionary point of view: species diversity and the evolution of behavioural controlling mechanisms, D. Crews; ecological constraints and the evolution of hormone-behaviour interrelationships, John C. Wingfield et al; evolutionary perspectives on primate mating systems and behaviour, Alan F. Dixson; emotion - an evolutionary by-product of the neural regulation of the autonomic nervous system, Stephen W. Porges. Part 2 Organismic perspectives on affiliation and social behaviour: psychobiological consequences of social relationships, S. Levine et al; attachment relationships in new world primates, Sally P. Mendoza and William A. Mason; hormonal modulation of sexual behaviour and affiliation in rhesus monkeys, Kim Wallen and Pamela L. Tannenbaum; conflict resolution and distress alleviation in monkeys and apes, Frans B.M. de Waal and Filippo Aureli; social facilitation, affiliation and dominance in the social life of spotted hyenas, Stephen E. Glickman et al; affiliative processes and vocal development, Charles T. Snowdon. Part 3 Monogamous mammals as models for understanding affiliation and social bonds: brain sexual dimorphism and sex differences in parental and other social behaviours, Geert J. DeVries and Constanza Villalba; peptides, steroids and pair bonding, C. Sue Carter et al; molecular aspects of monogamy, Thomas R. Insel et al; specific neuroendocrine mechanisms not involving generalized stress mediate social regulation of female reproduction in cooperatively breeding marmoset monkeys, David H. Abbott et al. Part 4 Neuroendocrine perspectives on social behaviour: brain systems for the mediation of social separation distress and social-reward - evolutionary antecedents and neuropeptide intermediaries, Jaak Panksepp et al; physiological and endocrine effects of social contract, Kerstin Uvnas-Moberg; early learning and the social bond, Eric B. Keverne et al; neuroanatomical circuitry for mammalian maternal behaviour, Michael Numan and Teige P. Sheehan; oxytocin control of maternal behaviour - regulation by sex steroids and offspring stimuli, Cort A. Pedersen; mating-induced c-fos expression patterns complement and supplement observations after lesions in the male Syrian hamster brain, Sarah Williams Newman et al; regulatory mechanisms of oxytocin-mediated sociosexual behaviour, Diane M. Witt. Part 5 Clinical perspectives on social behaviour: integrative functions of lactational hormones in social behaviour and stress management, C. Sue Carter and Margaret Altemus; psychobiology of early social attachment in rhesus monkeys - clinical applications, Gary W. Kraemer; psychological and neuroendocrinological sequelae of early social deprivation in institutionalized children in Romania, Mary Carlson and Felton Earls; affiliation and neuropsychiatric disorders - the deficit syndrome of schizophrenia, Brian Kirkpatrick.