Abstract-Social network and social capital are critical issues in sociology. There is a rising research tendency on the relationship among psychological variables in social network and social capital. Four common hypotheses were summarized based on comprehensive syntheses, and they were main effect hypothesis, mediator and moderator hypothesis, dynamic effect hypothesis, and synergistic effect hypothesis. Meanwhile, the methodology, definition and assessment should be considered, which induce new thoughts for future studies.
Keywords-social network; social capital; psychological variables
I. SOCIAL NETWORK, SOCIAL CAPITAL AND PSYCHOLOGICAL VARIABLESThe definition of social capital was formally proposed by the French sociologist Bourdieu in 1980, and then Coleman, Putnam, Portes and his colleagues redefined this concept and conducted a series of researches. Nan Lin [1] thought social capital as resources embedded in social networks which are rooted in social networks and social relations, therefore the social capital can be defined as the resources embedded in a social structure that can be obtained by purposeful actions. Yanjie Bian [2] pointed out that the forms of social capital was the network of relationships in social actors, and the essences was the resources which could be contained in the network and be transformed among social actors. None social actors can unilaterally have such resources, and it must be obtained by the development, accumulation and application of such resources in the network.At present, in researches on social network and social capital, empirical and quantitative studies gradually become the mainstream, in which the study of that focused on the social status attainment, social support, social stratification and occupational mobility. As continuous expansion of the study of social network and social capital in the social science, the influence were no longer limited to the academic sociology, which became a theme highly researched by scholars from different disciplines, such as psychology. The relationship study among social network, social capital and psychological variables show its vitality at its beginning.Sociology and psychology concern "punctate" (individual) and "linear" (the relationship between individuals) from different perspectives. Sociological researchers were interested in social network and social capital embedded in networks, but psychologists were oppositely concerned about the psychology impacts of social networks on individuals and groups, rather than social network itself. Sociology and psychology to treat persons and their relationships in society is seemingly disparate, but complementary. On the one hand, psychological status of individuals and groups were affected by the characteristics of their social networks; on the other hand, psychological factors of each individual and group had an impact on the formation and development as well as the final characteristics of social networks.The studies on relationships among social network, social capital and psycholo...