The ATP Project (Antipsychotic-TEP-Psychosis)

The goal of this observational study is to the early impacts of psychosis and antipsychotic medications on brain metabolism in young adults recently diagnosed with a first episode of psychosis. The main question aims to evaluate the effect of 4 to 6 weeks of antipsychotic medication on brain metabolism measured by PET scan (cerebral uptake of 11C-Acetoacetate + 18 Fluorodeoxyglucose). Participants will undergo a multimodal imaging protocol with other measures of psychopathology (e.g., cognition, depressive symptoms, etc.) and (metabolic marker, inflammation, etc).