“…The psychotic characteristics would decrease or disappear when the traumatic origins are identified. In 2004, Ross and Keyes [14] suggest the existence of a distinct group of people who suffer from schizophrenia, with dissociation as the underlying expression of psychotic symptoms and, in this sense, they propose to create the subtype of dissociative schizophrenia like the paranoid or the catatonic subtypes [10]. We have therefore found, through the history of hysteria, that the terms psychosis and hysteria are contained in a single concept, to mention hysterical psychosis (in ICD-10, dissociative disorder conversion is also called “hysterical psychosis”).…”