Try the 60's and for the second part - look up Dr. Richard Alpert, Ram Dass and Timothy Leary.

The entire phrase is "Turn on, tune in, drop out" - Timothy Leary. From the "21st Century Dictionary of Quotations," edited by the Princeton Language Institute (Dell Publishing, New York, 1993). : : : And the year was: 1967. "Counterculture figurehead Dr. Timothy Leary advises, 'Turn on, tune in, drop out." "When We Were Young: A Baby-Boomer Yearbook" by Rita Lang Kleinfelder (Prentice Hall, New York, 1993). : : In hippie parlance, 'to turn on' meant to liberate one's mind from conventions, materialism, negative thinking, etc., especially through the use of mind-altering drugs. 'Turn on, tune in, drop out' was the slogan of the LSD-guru Dr Timothy Leary (1920- ). : : From Brewer's Dictionary of 20th-Century Phrase and Fable (Cassell Publishers Limited, 1991) http://www.phrases.org.uk/bulletin_board/10/messages/703.html tune in Slang - To make or become aware or responsive: “Nobody tunes in to what anybody else is saying” (Bruce Allen). tune out Slang - 1. To disassociate oneself from one's environment: “The average reader, used to seeing the world in three-dimensional color, tunes out” (Carlin Romano). 2. To become unresponsive to; ignore: tuned out the children's screaming. http://www.answers.com/Tuned+In?cat=technology