Social motivation : some introductory notes / David Dunning -- Interpersonal threats and automatic motives / Justin H. Park and Abraham P. Buunk -- Belonging motivation : establishing, maintaining, and repairing relational value / Mark R. Leary and Ashley Batts Allen -- Cultural variation in the motivation of self-expression / Heejung S. Kim and Thai Q. Chu -- Sharing motivation / Gregory M. Walton and Geoffrey L. Cohen -- Four forms of prosocial motivation : egoism, altruism, collectivism, and principlism / C. Daniel Batson, Nadia Ahmad, and E.L. Stocks -- Why do people get involved? Motivations for volunteerism and other forms of social action / Clelia Anna Mannino, Mark Snyder, and Allen M. Omoto -- Understanding the psychology of trust / David Dunning and Detlef Fetchenhauer -- Social endocrinology: hormones and social motivation / Pranjal H. Mehta and Robert A. Josephs -- Power basis theory : a psychoecological approach to power / Felicia Pratto ... [et al.] -- System justification theory as compliment, complement, and corrective to theories of social identification and social dominance / John T. Jost.