Note 30 — III. GENERAL PATHOLOGY.[28]
Charles Gilbert Chaddock translation
An interesting example of how an imperative conception of non-sexual content can exert an influence is related by Magnan (Ann. méd. psych., 1885): Student, aged 21, strongly predisposed hereditarily, previously a masturbator, constantly struggles with the number 13 as an imperative conception. As soon as he attempts coitus the imperative idea inhibits erection and makes the act impossible.