Freud's theory of the three selves was: the id, the ego, and the superego.
The superego was the moralized self, the last and most civilized part of the personality to form. Aside from extremely antisocial and anti-human groups, most people possessed a superego composed of moral laws, ego ideals, and other elements, which cared about the restraints of social morality and ethics and supervised and controlled the impulses of the id. The superego was the highest stage of ego development, encompassing loneliness, universal love, and faith.
The ego was the arbitrator between the id and the superego. This part of the personality sought satisfaction while avoiding pain, using rules to reconcile the contradictions between the id and the superego.
The id consisted of all innate instinctive impulses and was governed solely by the "pleasure principle," blindly pursuing satisfaction. In a sense, the seven deadly sins of human nature—pride, gluttony, greed, wrath, envy, sloth, and lust—could all represent the id. It brought the individual direct pleasure and was also the source of all psychological energy.
Some believed that once a hypnotist controlled a subject's will, and the subject "submitted to the hypnotist's power," they would never be able to break free.
Such things could indeed happen under extreme circumstances, but those situations bore no resemblance to hypnosis as used in clinical settings. Hypnosis emphasized cooperation rather than coercion. A hypnotized person remained conscious. Refusing to jump off a building was the desire to survive, while refusing to rob or murder was the effect of the superego.
Drug-induced robbery cases had kept occurring for years. Although the authorities repeatedly declared that no drugs existed that could control a person's mind, similar cases continued to happen.
The principle was simple. Criminals used anesthetics to make you dizzy and sluggish in thought; many psychiatric