Ferenczi from making his views public. Karin Ahbel-Rappe concludes in her study "'I no longer believe': did Freud abandon the seduction theory?": "Freud marked out and started down a trail of investigation into the nature of the experience of infantile incest and its impact on the human psyche, and then abandoned this direction for the most part." Cocaine As a medical researcher, Freud was an early user and proponent of cocaine as a stimulant as well as analgesic. He believed that cocaine was a cure for many mental and physical problems, and in his 1884 paper "On Coca" he extolled its virtues. Between 1883 and 1887 he wrote several articles recommending medical applications, including its use as an antidepressant. He narrowly missed out on obtaining scientific priority for discovering its anesthetic properties of which he was aware but had mentioned only in passing. (Karl Koller, a colleague of Freud's in Vienna, received that distinction in 1884 after reporting to a medical society the ways cocaine could be used in delicate eye surgery.) Freud also recommended cocaine as a cure for morphine addiction. He had introduced cocaine to his friend Ernst von Fleischl-Marxow, who had become addicted to morphine taken to relieve years of excruciating nerve pain resulting from an infection acquired after injuring himself while performing an autopsy. His claim that Fleischl-Marxow was cured of his addiction was premature, though he never acknowledged that he had been at fault. Fleischl-Marxow developed an acute case of "cocaine psychosis", and soon returned to using morphine, dying a few years later still suffering from intolerable pain. The application as an anaesthetic turned out to be one of the few safe uses of cocaine, and as reports of addiction and overdose began to filter in from many places in the world, Freud's medical reputation became somewhat tarnished. After the "Cocaine Episode" Freud ceased to publicly recommend the use of the drug, but continued to take it himself occasionally for depression, migraine and nasal inflammation during the early 1890s, before discontinuing its use in 1896. The unconscious The concept of the unconscious was central to Freud's account of the mind. Freud believed that while poets and thinkers had long known of the existence of the unconscious, he had ensured that it received scientific recognition in the field of psychology. Freud states explicitly that his concept of the unconscious as he first formulated it was based