Clinical Trial to Evaluate the Efficacy of Treatment vs Discontinuation in a First Episode of Non-affective Psychosis

Inclusion Criteria: * Adult age from 18 to 55 years old * Non-affective psychosis diagnosis (schizophrenia, schizoaffective, schizophreniform disorders, acute psychosis, other psychosis according to Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV). * Antipsychotic treatment for 12 months since clinical stabilization. Clinical stabilization is defined in case of admission by medical discharge (not including voluntary discharge). In case of voluntary discharge or no admission to hospital, clinical stabilization can be defined by the psychiatrist according to medical history and the information provided by the family. * No changes in the antipsychotic doses in the last 4 months. * No suicide attempts in the last 12 months. * Patient who shows remission criteria. * Signed informed consent form. Exclusion Criteria: * Patient who is not fluent in Spanish language * Patient who takes mood stabilizers (Lithium, antiepileptic drugs...) * Dependency on alcohol or other substances of abuse (cannabis, cocaine...) * History of brain injury with loss of consciousness for more than 1 hour, stroke or other central nervous system disorders. * Intelligence testing (IQ) less than 70. * Suicide attempt from stabilization. * Pregnancy or planning to become pregnant during the study.