Psychonautics (from the Greek ψυχή (psychē "soul/spirit/mind") and ναύτης (naútēs "sailor/navigator") – a sailor of the mind/soul) refers both to a methodology for describing and explaining the subjective effects of altered states of consciousness, including those induced by meditation or mind altering substances, and to a research paradigm in which the researcher voluntarily immerses him/herself into an altered state by means of such techniques, as a means to explore human experience and existence.
The term has been applied diversely, to cover all activities by which altered states are induced and utilized for spiritual purposes or the exploration of the human condition, including shamanism, lamas of the Tibetan Buddhist tradition, sensory deprivation, and archaic/modern drug users who use entheogenic substances in order to gain deeper insights and spiritual experiences. A person who uses altered states for such exploration is known as a psychonaut.
Etymology and categorization 
The term psychonautics derives from the prior term psychonaut, usually attributed to German author Ernst Jünger who used the term in describing Arthur Heffter in his 1970 essay on his own extensive drug experiences Annäherungen: Drogen und Rausch (literally: "Approaches: Drugs and Inebriation"). In this essay, Jünger draws many parallels between drug experience and physical exploration — for example, the danger of encountering hidden "reefs".
Peter J. Carroll made Psychonaut the title of a 1982 book on the experimental use of meditation, ritual and drugs in the experimental exploration of consciousness and of psychic phenomena, or "chaos magic". The term's first published use in a scholarly context is attributed to ethnobotanist Jonathan Ott, in 2001.
Definition and usage 
Clinical psychiatrist Jan Dirk Blom describes psychonautics as denoting "the exploration of the psyche by means of techniques such as lucid dreaming, brainwave entrainment, sensory deprivation, and the use of hallucinogenics or entheogens", and a psychonaut as one who "seeks to investigate their mind using intentionally induced altered states of consciousness" for spiritual, scientific, or research purposes.
Psychologist Dr. Elliot Cohen of Leeds Metropolitan University and the UK Institute of Psychosomanautics defines psychonautics as "the means to study and explore consciousness (including the unconscious) and altered states of consciousness; it rests on the realisation that to study consciousness is to transform it." He associates it with a long tradition of historical cultures worldwide. Leeds Metropolitan University is currently the only university in the UK to offer a module in Psychonautics.
Robert Thurman depicts the Tibetan Buddhist master as a psychonaut, stating that "Tibetan lamas could be called psychonauts, since they journey across the frontiers of death into the in-between realm".
The aims and methods of psychonautics, when state-altering substances are involved, is commonly distinguished from recreational drug use by research sources. Psychonautics as a means of exploration need not involve drugs, and may take place in a religious context with an established history. Cohen considers psychonautics closer in association to wisdom traditions and other transpersonal and integral movements.
However there is considerable overlap with modern drug use and due to its modern close association with psychedelics and other drugs it is also studied in the context of drug abuse from a perspective of addiction, the drug abuse market and online psychology, and studies into existing and emerging drugs within toxicology.
- Hallucinogens and especially psychedelics like LSD, DMT, psilocybin mushrooms, and Peyote, but also dissociatives like ketamine (famously used in psychonautic endeavors by John C. Lilly), DXM, and Salvia divinorum
- Disruption of psychological and physiological processes required for usual mental states - sleep deprivation, fasting, sensory deprivation, oxygen deprivation/smoke inhalation, holotropic breathwork
- Ritual, both as a means of inducing an altered state, and also for practical purposes of grounding and of obtaining suitable focus and intention
- Dreaming, in particular lucid dreaming in which the person retains a degree of volition and awareness, and dream journals
- Meditative or trance inducing dance, like Sufi whirling can also be used to induce altered state of consciousness
- Biofeedback and other devices that change neural activity in the brain (brainwave entrainment) by means of light, sound, or electrical impulses, including: mind machines, dreamachines, binaural beats, and cranial electrotherapy stimulation
These may be used in combination; for example traditions such as shamanism may combine ritual, fasting, and hallucinogenic substances.
- Blom, Jan Dirk (2009). A Dictionary of Hallucinations. Springer. p. 434. ISBN 978-1-4419-1222-0. Retrieved 2010-03-05.
- Newcombe, Russell (2008). "Ketamine Case Study: The Phenomenology of a Ketamine Experience". Addiction Research & Theory 16 (3): 209. doi:10.1080/16066350801983707. Retrieved 2010-03-05.
- As noted by Flores, Ralph (2008). Buddhist scriptures as literature: sacred rhetoric and the uses of theory. ISBN 978-0-7914-7339-9. Retrieved 2010-03-05.
- van Riel (2007). "New Drugs of Abuse". Clinical Toxicology 45 (4). Retrieved 2010-03-05.
- Jünger. "Psychonauten". Annaherungen: Drogen und Rausch. p. 430. - cited in Taylor et al (2005). The Encyclopedia of Religion and Nature. Thoemmes Continuum. p. 1312. Retrieved 2010-03-05.
- Carroll, Peter J. Liber Null. (1978) and Psychonaut. (1982) (published in one volume in 1987). ISBN 0-87728-639-6.
- Ott, Jonathan (2001). "Pharmanopo-Psychonautics: Human Intranasal, Sublingual, Intrarectal, Pulmonary and Oral Pharmacology of Bufotenine". Journal of Psychoactive Drugs 33 (3): 273–282. doi:10.1080/02791072.2001.10400574. PMID 11718320. Retrieved 2010-03-05. - cited by Blom, Jan Dirk (2009). A Dictionary of Hallucinations. Springer. p. 434. ISBN 978-1-4419-1222-0. Retrieved 2010-03-05.
- UK Institute of Psychonautics and Somanautics page at his "Academy for Transpersonal Studies". Retrieved 10 March 2010.
- Schifano, Fabrizio; Leoni, Mauro; Martinotti, Giovanni; Rawaf, Salman; Rovetto, Francesco (August 2003). "Importance of Cyberspace for the Assessment of the Drug Abuse Market: Preliminary Results from the Psychonaut 2002 Project". CyberPsychology & Behavior 6 (4): 405. doi:10.1089/109493103322278790. Retrieved 2010-03-05.
- Bigwood, Jeremy; Stafford, Peter J. (1992). Psychedelics encyclopedia. Berkeley, CA: Ronin Pub. pp. 118–9. ISBN 0-914171-51-8.