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[[Lacan]] returns to this question in 1946, where the [[cause]] of [[madness]] becomes the very essence of all psychical [[causality]].   In the 1946 paper he reiterates his earlier view that a specifically [[psyche|psychical]] [[cause]] is needed to explain [[psychosis]]; however, he also questions the possibility of defining "[[psychical]]" in terms of a simple opposition to the concept of matter, and this leads him, in 1955, to dispense with the simplistic notion of "psychogenesis."<ref>{{S3}} p. 7</ref>.