Romantic couples (N = 194) participated in an investigation of caregiving processes in adulthood. In Phase 1, couple members completed questionnaires designed to identify attachment style differences in caregiving behavior and to explore the underlying (personal and relationship) mechanisms that lead people with different attachment styles to be effective or ineffective caregivers. Results revealed that social support knowledge, prosocial orientation, interdependence, trust, and egoistic

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... ion mediated the link between attachment style and caregiving. In Phase 2, responsive caregiving was assessed behaviorally by exposing one member of the couple to a stressful laboratory situation and experimentally manipulating his or her need for support. Results revealed that attachment style and mediating mechanisms identified in Phase 1 also predicted observable support behavior in a specific episode in which a partner had a clear need for support.