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
Turn on, tune in, drop out experience, peace and many other issues. In a 1988 interview with Neil Strauss, Leary said the slogan was "given to him" by Marshall McLuhan during a lunch in New York City. Leary added that McLuhan "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 a Pepsi commercial of the time. Then he started going, 'Tune in, turn on, and drop out. The phrase was used by Leary in a speech he delivered at the opening of a press conference in