A psychedelic experience is characterized by the perception of aspects of one's mind previously unknown, or by the creative exuberance of the mind liberated from its ostensibly ordinary fetters. Psychedelic states are an array of experiences elicited by sensory deprivation as well as by psychedelic substances. Such experiences include hallucinations, changes of perception, synesthesia, altered states of awareness, mystical states, and occasionally states resembling psychosis.
The term was first coined as a noun in 1957 by psychiatrist Humphry Osmond as an alternative descriptor for hallucinogenic drugs in the context of psychedelic psychotherapy. The term featured prominently in a now-famous exchange with Aldous Huxley, in which the little-used term phanerothyme (derived from roots relating to "spirit" or "soul") was suggested:
The fashion for psychedelic drugs gave its name to the visual style of psychedelia, a term describing a category of rock music known as psychedelic rock, visual art, fashion, and culture that is associated originally with the high 1960s, hippies, and the Haight-Ashbury neighborhood of San Francisco, California. Psychedelia generally began in 1966, but truly took off in 1967 with the Summer of Love. Although associated with San Francisco, the style soon spread across the U.S.A., and worldwide.
The counterculture of the 1960s had a strong influence on the popular culture of the early 1970s, and is well recognized even by those who are naïve to its psychedelic origins. It later became linked to a style of electronic dance music commonly known as psytrance.
[edit] Modern usage [citations needed] The impact of psychedelic drugs on western culture in the 1960s led to semantic drift in the use of the word "psychedelic", and it is now frequently applied to describe any brightly patterned or colored object. In objection to this new meaning, and to the pejorative meanings of other synonyms such as "hallucinogen" and "psychotomimetic", the term "entheogen" was proposed and is seeing increasing use. However, many consider the term "entheogen" best reserved for religious and spiritual usage, such as certain Native American churches do with the peyote sacrament, and "psychedelic" left to describe those who are using these drugs for recreation.
At the same time as psychedelic drugs were being used by the counterculture of the 1960s, they were also being used in experiments by governments, who saw them and sensory deprivation as useful agents for mind control; see MKULTRA for the CIA involvement in the use of psychedelic drugs.