Pierre Janet, a French professor of psychology who became prominent in the early twentieth century, attempted to fully chronicle late- Victorian hysteria in his landmark work The Major Symptoms of Hysteria. His catalogue of symptoms was staggering, and included somnambulism (not sleepwalking as we think of it today, but a sort of amnesiac condition in which the patient functioned in a trance state, or "second state," and later remembered nothing); trances or fits of sleep that could last for days, and in which the patient sometimes appeared to be dead; contractures or other disturbances in the motor functions of the limbs; paralysis of various parts of the body; unexplained loss of the use of a sense such as sight or hearing; loss of speech; and disruptions in eating that could entail eventual refusal of food altogether. Janet's profile was sufficiently descriptive of Mollie Fancher that he mentioned her by name as someone who "seems to have had all possible hysterical accidents and attacks." In the face of such strange and often intractable "attacks," many doctors who treated cases of hysteria in the 1800s developed an ill-concealed exasperation.

The return of the voices would end in a migraine that made my whole body throb. I could do nothing except lie in a blacked-out room waiting for the voices to get infected by the pains in my head and clear off. Knowing I was different with my OCD, anorexia and the voices that no one else seemed to hear made me feel isolated, disconnected. I took everything too seriously. I analysed things to death. I turned every word, and the intonation of every word over in my mind trying to decide exactly what it meant, whether there was a subtext or an implied criticism. I tried to recall the expressions on people’s faces, how those expressions changed, what they meant, whether what they said and the look on their faces matched and were therefore genuine or whether it was a sham, the kind word touched by irony or sarcasm, the smile that means pity. When people looked at me closely could they see the little girl in my head, being abused in those pornographic clips projected behind my eyes? That is what I would often be thinking and such thoughts ate away at the façade of self-confidence I was constantly raising and repairing. (describing dissociative identity disorder/mpd symptoms)