Psychopathia sexualis: With especial reference to contrary sexual instinct

5. In the majority of cases, psychical anomalies (brilliant endowment in

art, especially music, poetry, etc., by the side of bad intellectual powers or original eccentricity) are present, which may even go so far as pronounced conditions of mental degeneration (dementia, moral insanity). In many urnings, either temporarily or permanently, insanity of a degenerative character (pathological emotional states, periodical insanity, paranoia, etc.) makes its appearance.