Differential outcome of a therapeutic community program for internalizing and externalizing personality disorders: A change in cognitive processes mediates symptom improvement

Abstract

The identification of transdiagnostic mediating processes involved in a therapeutic change and their relationship with personality can contribute to a better adjustment of a therapeutic technique, enhancing its effectiveness. In a sample of 158 adults diagnosed with personality disorder who complete an inpatient therapeutic community program for 6 months, the hypothesis of a differential reduction in symptom intensity according to the externalizer/internalizer typology is tested, and cognitive variables mediating change are explored. A pre-post change (p = .000, ηp2 = .50) is observed, along with a difference between externalizers and internalizers (p = .002, ηp2 = .06), and an interaction effect (p = .037, ηp2 = .03). The effect of personality type on symptom change (β = .43, p = .009) is no longer significant when negative automatic thoughts and dysfunctional attitudes are considered as mediators (β = .06, p = .549). Findings are discussed from the perspective of personality disorder as a vulnerability factor.