The influence of attachment style on interpersonal learning in substance use psychotherapy groups

Substance Use Disorders (SUDs) are prevalent, long-term conditions, commonly treated via group intervention. Additionally, interpersonal learning (IL) is a therapeutic factor unique to group treatment programs, which has been associated with successful group therapy outcomes. While previous research has suggested attachment styles may predict experiences of IL within groups, research in this area is limited. Therefore, this study aims to investigate if attachment style impacts IL, within SUD group treatment programs and specifically, if anxious and avoidant attachment styles influence IL. Participants (N = 38) were recruited voluntarily from an outpatient SUD open group therapy program at a private mental health hospital in Sydney. All participants completed paper-based self-report questionnaires to assess attachment style and IL. Two separate Multiple Linear Regressions (MLRs) revealed anxious attachment was not a significant predictor of IL and avoidant attachment was a significant, negative predictor of IL. Additionally, thematic analysis of qualitative data revealed themes and behaviours which may improve IL. Thus, future directions and implications of the study’s findings indicate the need to conduct additional research into members attachment-based needs to enhance SUD group treatment outcomes.