Biological approaches to the study of social engagement / Peter J. Marshall & Nathan A. Fox -- Temperamental exuberance : correlates and consequences / Cindy P. Polak-Toste & Megan R. Gunnar -- Neural bases of infants' processing of social information in faces / Michelle de Haan & Margriet Groen -- Joint attention, social engagement, and the development of social competence / Peter C. Mundy & C. Françoise Acra -- The social dimension in language development : a rich history and a new frontier / Shannon M. Pruden, Kathy Hirsh-Pasek, & Roberta Michnick Golinkoff -- Neurocognitive bases of preschoolers' theory-of-mind development : integrating cognitive neuroscience and cognitive development / Mark A. Sabbagh -- The neurobiology of social bonds and affiliation / Miranda M. Lim & Larry J. Young -- The neurobiology of maternal behavior in mammals / Frédéric Lévy & Alison S. Fleming -- Play and the development of social engagement : a comparative perspective / Sergio M. Pellis & Vivien C. Pellis -- Evolutionary perspectives on social engagement / Heidi Keller & Athanasios Chasiotis -- Understanding impairments in social engagement in autism / Raphael Bernier, Sara Jane Webb, & Geraldine Dawson -- Social engagement in Williams syndrome / Helen Tager-Flusberg & Daniela Plesa-Skwerer -- The psychological effects of early institutional rearing / Michael Rutter.