Schema modes as a common mechanism of change in personality pathology and functioning: Results from a randomized controlled trial.

Objective: We aimed to empirically test whether schema modes are central to the change process in schema therapy, clarification-oriented psychotherapy, and treatment as usual, i.e., predictive of personality pathology, and global and social-occupational functioning.

Method: A multicenter randomized controlled trial was conducted (N = 139 men, N = 181 women) over the course of three years. Repeated assessments of schema modes, personality disorder (PD) severity and functioning (controlled for concurrent PD-pathology) were analyzed using a multilevel autoregressive model. Variables were person-centered to ensure that within-person changes were analyzed. Through a process of backward elimination, the schema modes predictive of the dependent variable (i.e., PD-severity and functioning) at a later point in time were identified while controlling for concurrent dependent variable levels. Bidirectionality was tested by assessing whether dependent variables predicted later schema modes.

Results: The Healthy Adult, Vulnerable Child, Impulsive Child, and Avoidant Protector predicted later personality pathology, with no bidirectionality observed for the first two. The Healthy Adult and Self-Aggrandizer predicted functioning at a later point in time, with no bidirectionality for Self-Aggrandizer. There was no moderation by treatment type for PD symptomatology, except for Self-Aggrandizer, which predicted functioning only in schema therapy.

Conclusions: The Healthy Adult and Vulnerable Child are central to the change process and appear to reflect common mechanisms of change. The Self-Aggrandizer might reflect a change mechanism specific for schema therapy. Our findings support the recent emphasis on these modes in schema therapy.