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Sigmund Freud skriver til sin venn Wilhelm Fliess i Berlin (her gjengitt i engelsk oversettelse -- originalen er på tysk):
"Hysterical cold shivers = being taken out of a warm bed. Hysterical headache with sensations of pressure on the top of the head, temples, and so forth, is characteristic of the scenes where the head is held still for the purpose of actions in the mouth. (Later reluctance at photographer's, who holds the head in a clamp.)
