Examining within- and between-member cohesion and working alliance effects on group members' motivation: a preliminary actor-partner interdependence study.

OBJECTIVE

Informed by the person-environment fit theory, this preliminary study examined if a fit between a group member's treatment experience and their working therapy context (other group members' aggregated treatment experiences) were related to their level of motivation within a group treatment for healing from internalized weight stigma.

METHOD

We examined the relationship between two types of within-member and between-member's group cohesion, working alliance, and motivation. Specifically, we utilized the Actor-Partner Interdependence Model to operationalize the impact of actor's within-member cohesion and alliance (personal changes over time) and between-member cohesion and alliance (individual differences) as well as partner's within-member cohesion and alliance (contextual changes over time) and between-member cohesion and alliance (contextual differences) on group members' motivation. This study utilized self-report data from 26 group members who participated in three online weight stigma psychotherapy groups.

RESULTS

For cohesion, results suggested that the relationship between partner within-member cohesion and motivation was larger for members who reported low cohesion across all the sessions compared to the other members of their group. Additionally, an individual group member who perceived a group session more cohesive than they did on average, reported increased motivation in that session, and this relationship was stronger for members who on average perceived their group less cohesive than other group members. Lastly, session-level alliance was more strongly associated with an individual member's motivation in that session when the other group members reported higher group alliance on average.

CONCLUSIONS

These findings underscore the significance of member-group fit in group therapy and the reciprocal impact of individual members and the group on each other's therapy outcomes.