Interactional synchrony and negative symptoms: An outcome study of body-oriented psychotherapy for schizophrenia

We sought to assess the efficacy of a manualized body-oriented psychotherapy (BPT) intervention for schizophrenia, by focusing on improvement of negative symptoms and on changes in interactional synchrony. We also explored aspects of a phenomenological theory of schizophrenia, which states that negative symptoms should be understood within an encompassing disturbance of subjectivity and intersubjectivity.

Sixteen persons with schizophrenia participated in 10 weeks of BPT. General psychiatric symptomatology and negative symptoms were assessed before and after therapy. Interactional synchrony was assessed via cross-correlations of movements between patient and interviewer in interviews conducted before and after therapy.

Psychiatric symptomatology and negative symptoms significantly improved with a medium effect size. We also demonstrated a significant increase in interactional synchrony with a strong effect size. Post hoc analyses showed a significant increase only with open-ended interviews conducted by the same interviewer. Furthermore, we explored the correlation between negative symptoms and interactional synchrony, finding a large inverse relationship.

BPT for schizophrenia may effectively reduce patients' negative symptoms and psychiatric symptomatology. Moreover, it may yield some recovery of pre-reflective social relations. Further evidence of the specific relation between negative symptoms and interactional synchrony would support a phenomenologically informed holistic view of schizophrenia.