Trainee therapist personality and the rating of cognitive behavioural and dynamic interpersonal therapy processes.

Therapist factors are generally thought to be important predictors of the capacity to understand and respond to clinical material. The current study aims to identify which features of personality and clinical symptomatology predict a trainee therapist's rating of cognitive behavioural (CB) and psychodynamic interpersonal (PI) processes in video recordings of these therapies. Eighty psychology trainees completed the Minnesota Multiphasic Personality Inventory-2-Restructured Form (MMPI-2-RF) and watched two video recordings of therapy sessions showing prototypical examples of CB and PI psychotherapy, rating the processes they could identify using the Comparative Psychotherapy Process Scale (CPPS). Trainees accurately differentiated CB from PI process while viewing the CB session but rated the CB video higher in PI processes than the PI video itself. Bayesian regression models showed that the most consistent MMPI-2-RF scale that predicted variance in ratings was hypomanic activation (RC9) predicting higher ratings of all psychotherapy processes in both conditions, while clinical scale factors such as Aggressiveness-Revised (AGGR-r) and personality scale factors of Psychoticism-Revised (PSYC-r) and Negative Emotionality/Neuroticism-Revised (NEGE-r) showed some notable but less consistent predictions. The variances in psychotherapy process ratings accounted for by MMPI-2-RF scales ranged from 15% to 51%. The study suggests that some clinical symptoms and personality factors do influence the rating of psychotherapy processes by psychology trainees, but further studies would be required to substantiate such findings. These findings have relevance to therapist training and selection for clinical training and therapist mental health.