Self-determination theory as a fundamental theory of close relationships.

Though relatively young, the field of relationships science has an impressive body of research devoted to understanding a range of relational processes including attachment, communality, intimacy, and interdependence. However, relatively little research has examined the motivational underpinnings of these processes. Self-determination theory (SDT) offers a broad perspective on the mechanisms through which relational processes are related to personal well-being and relational functioning and the circumstances under which seemingly positive relational processes particularly result in benefits to relationships and the individuals of which they are comprised. The purpose of this review is to summarise the existing research applying SDT to relational processes and to suggest future avenues for research that will extend both relationships science and SDT.