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

Abstract 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 disorders (PDs) 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.