Turn on, tune in, drop out New York City on September 19, 1966. It urged people to embrace cultural changes through the use of psychedelics by detaching themselves from the existing conventions and hierarchies in society. It was also the motto of his League for Spiritual Discovery. The phrase was derided by more conservative critics. In his speech, Leary said: Leary later explained in his 1983 autobiography "Flashbacks": "Turn on, tune in, drop out" is also the title of a book () of essays by Timothy Leary, covering topics ranging from religion, education, and politics to Aldous Huxley, neurology, and psychedelic drugs. Leary later (during the
Timothy Leary drop out." In a 1988 interview with Neil Strauss, he said that this slogan was "given to him" by Marshall McLuhan when the two had lunch in New York City, adding, "Marshall was very much interested in ideas and marketing, and he started singing something like, 'Psychedelics hit the spot / Five hundred micrograms, that's a lot,' to the tune of [the well-known Pepsi 1950s singing commercial]. Then he started going, 'Tune in, turn on, and drop out.'" Though the more popular "turn on, tune in, drop out" became synonymous with Leary, his actual definition with the League for Spiritual