In this 1.5 hour lecture, Dr. Garrett summarizes research that bears on the question, “What mediates between trauma and psychosis?” Dr. Garrett compares and contrasts the phenotypic manifestations of PTSD and psychosis, respectively, presenting evidence for the view that psychotic symptoms constitute disguised recollections of trauma. Dr. Garrett illustrates this idea in a detailed description of the successful psychotherapy of a chronically psychotic man, unresponsive to medication, who feared that he might be arrested, with a video clip of the patient reflecting on his treatment.