A<unk> , or trip, is characterized by the perception of aspects of one's mind previously unknown, or by the creative exuberance of the mind liberated from its ordinary fetters.<unk>  states are one of the stations on the spectrum of<unk> s elicited by sensory deprivation as well as by<unk>  substances. On that same spectrum will be found hallucinations, changes of perception, synesthesia, altered states of awareness, mystical states, and occasionally states resembling psychosis. The word<unk>  comes from a combination of two Greek words: psyche (ψυχή) and delos (δήλος). Literally, it means "mind manifesting".
The<unk>  is an intimate<unk> , but there are many common themes, and ranges from a sense of connectedness to everything in the immediate vicinity, to a sense of oneness with everything in the universe. Potentially, the range of the drug-induced<unk>  goes far beyond other drugs, illicit in particular. Simply because "trip drugs", or hallucinogenic drugs have these effects, in contrast to say heroin, and its depressant effects.
Many who undertake such<unk> s come to see them as an ordeal, and mentally overbearing. For many, such<unk> s come to be seen as personal re-enactments of the hero's journey.<unk>  drugs can be used as a means to achieve states of mind in which different perceptions unhindered by everyday mental filters and processes can arise. Hallucinations and the mental, emotional and long term impact of the<unk>  are positive and enduring for many.
There has been research, largely during the 1960s, suggesting that<unk>  drugs may be able to lead to breakthrough<unk> s during psychotherapy and or have documented pharmaceutical advantages.
The Multidisciplinary Association for<unk>  Studies or MAPS is a more current organization that studies the effects of<unk> s.  They have a number of books and other scientific journals that have documented<unk> s and information.
Psychedelic experience
Somatization
Homicidal ideation
Emotional detachment
Chronophobia
Automatic behavior
Intrusive thoughts
Snatiation