Several studies have highlighted the utmost importance of initial medical and psychosocial support during a first psychotic episode. Recent research has shown that non-verbal communication and particularly interpersonal motor synchronization between the patient and his psychiatrist is a key factor in therapeutic alliance. However, such hypothesis have never been tested in terms of treatment adherence neither in a first psychotic episode, nor during a 6-month follow-up. By measuring the interpersonal motor synchronization between the patient and psychiatrist during a video recorded interview at inclusion, month-3 and month-6, the project aims to validate the hypothesis that a high level of interpersonal synchronization should be associated with a high level of therapeutic alliance. This therapeutic alliance being hypothesized as a mediator between synchronization and treatment adherence, the project should show for the first time in a first psychotic episode that the use of reliable and objective variables extracted from the analysis of the synchronization between psychiatrist and patient allows to predict the outcome of therapeutic and treatment alliance.
