She incites man to know what causes his desire, inciting him to acknowledge her as the inaccessible object of his desire. This intrigue of the hysteric is open to everyday observation. Offering her charms, she captivates the man. Here the castrating dimension of the hysteric's game becomes evident. But the erratic quality of the hysteric's discourse derives more from the structure which necessitates hysteria than from the hysteric who asks to be interpreted in terms of the structure.
Hysteria is an elementary effect of language.
As an intelligible phenomenon it follows from the structure of the Demand. This structure, in fact, is identical with hysteria. Immersed in language, the subject is hysterical as such. Freud fulfilled this demand, and so did Lacan. This constitutes his knowledge, or rather the knowledge the hysteric attributes to him.