“Anna O. had a third state as well, which today would be called a hidden observer, internal self helper, or center. This was an entity described as follows: "A clear-sighted and calm observer up sat, as she put it, in a corner of her brain and looked on at all the mad business" [p. 101].” Dissociative Identity DisorderAlter PersonalitiesAlterIshHidden ObserverInternal Self Helper Book:Dissociative Identity Disorder: Diagnosis, Clinical Features, and Treatment of Multiple Personality Source: Dissociative Identity Disorder: Diagnosis, Clinical Features, and Treatment of Multiple Personality