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A psychedelic experience (known colloquially as a trip) is a temporary
altered state of consciousness An altered state of consciousness (ASC), also called altered state of mind or mind alteration, is any condition which is significantly different from a normal waking state. By 1892, the expression was in use in relation to hypnosis, though there ...
induced by the consumption of a
psychedelic Psychedelics are a subclass of hallucinogenic drugs whose primary effect is to trigger non-ordinary states of consciousness (known as psychedelic experiences or "trips").Pollan, Michael (2018). ''How to Change Your Mind: What the New Science of ...
substance (most commonly
LSD Lysergic acid diethylamide (LSD), also known colloquially as acid, is a potent psychedelic drug. Effects typically include intensified thoughts, emotions, and sensory perception. At sufficiently high dosages LSD manifests primarily mental, vi ...
,
mescaline Mescaline or mescalin (3,4,5-trimethoxyphenethylamine) is a naturally occurring psychedelic protoalkaloid of the substituted phenethylamine class, known for its hallucinogenic effects comparable to those of LSD and psilocybin. Biological sou ...
,
psilocybin mushrooms Psilocybin mushrooms, commonly known as magic mushrooms, are a polyphyletic informal group of fungi that contain psilocybin which turns into psilocin upon ingestion. Biological genera containing psilocybin mushrooms include ''Psilocybe'', ''Pan ...
, or
DMT ''N'',''N''-Dimethyltryptamine (DMT or ''N'',''N''-DMT, SPL026) is a substituted tryptamine that occurs in many plants and animals, including human beings, and which is both a derivative and a structural analog of tryptamine. It is used as a ...
). For example, an acid trip is a psychedelic experience brought on by the use of LSD, while a mushroom trip is a psychedelic experience brought on by the use of psilocybin. Psychedelic experiences feature alterations in normal
perception Perception () is the organization, identification, and interpretation of sensory information in order to represent and understand the presented information or environment. All perception involves signals that go through the nervous system ...
such as visual distortions and a subjective loss of self-identity, sometimes interpreted as
mystical experience Scholarly approaches to mysticism include typology (disambiguation), typologies of mysticism and the explanation of mystical states. Since the 19th century, mystical experience has evolved as a distinctive concept. It is closely related to "mystic ...
s. Psychedelic experiences lack predictability, as they can range from being highly pleasurable (known as a good trip) to frightening (known as a
bad trip A bad trip (also known as challenging experiences, acute intoxication from hallucinogens, psychedelic crisis, or emergence phenomenon) is an acute adverse psychological reaction to classic hallucinogens. With proper screening, preparation, and su ...
). The outcome of a psychedelic experience is heavily influenced by the person's mood, personality, expectations, and environment (also known as
set and setting Set and setting, when referring to a psychedelic drug experience or the use of other psychoactive substances, means one's mindset (shortened to "set") and the physical and social environment (the "setting") in which the user has the experience. ...
). Researchers have interpreted psychedelic experiences in light of a range of scientific theories, including model psychosis theory, filtration theory,
psychoanalytic theory Psychoanalytic theory is the theory of personality organization and the dynamics of personality development that guides psychoanalysis, a clinical method for treating psychopathology. First laid out by Sigmund Freud in the late 19th century, psyc ...
, entropic brain theory,
integrated information theory Integrated information theory (IIT) attempts to provide a framework capable of explaining why some physical systems (such as human brains) are conscious, why they feel the particular way they do in particular states (e.g. why our visual field appe ...
, and predictive processing. Psychedelic experiences are also induced and interpreted in religious and spiritual contexts.


Etymology

The term ''
psychedelic Psychedelics are a subclass of hallucinogenic drugs whose primary effect is to trigger non-ordinary states of consciousness (known as psychedelic experiences or "trips").Pollan, Michael (2018). ''How to Change Your Mind: What the New Science of ...
'' was coined by the psychiatrist
Humphrey Osmond Humphry Fortescue Osmond (1 July 1917 – 6 February 2004) was an English psychiatrist who expatriated to Canada, then moved to work in the United States. He is known for inventing the word ''psychedelic'' and for his research into interesting a ...
during written correspondence with author
Aldous Huxley Aldous Leonard Huxley (26 July 1894 – 22 November 1963) was an English writer and philosopher. He wrote nearly 50 books, both novels and non-fiction works, as well as wide-ranging essays, narratives, and poems. Born into the prominent Huxley ...
and presented to the New York Academy of Sciences by Osmond in 1957. It is derived from the
Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...
words egy, ψυχή, translit=psychḗ, lit=soul, mind, label=none and egy, δηλείν, translit=dēleín, lit=to manifest, label=none thus meaning "mind manifesting," the implication being that psychedelics can develop unused potentials of the human mind. The term ''trip'' was first coined by US Army scientists during the 1950s when they were experimenting with LSD.


Phenomenology

Despite several attempts that have been made, starting in the 19th and 20th centuries, to define common phenomenological structures of the effects produced by classic psychedelics, a universally accepted taxonomy does not yet exist.


Visual alteration

A prominent element of psychedelic experiences is visual alteration. Psychedelic visual alteration often includes spontaneous formation of complex flowing geometric visual patterning in the visual field. When the eyes are open, the visual alteration is overlaid onto the objects and spaces in the physical environment; when the eyes are closed the visual alteration is seen in the "inner world" behind the eyelids. These visual effects increase in complexity with higher dosages, and also when the eyes are closed. The visual alteration does not normally constitute
hallucination A hallucination is a perception in the absence of an external stimulus that has the qualities of a real perception. Hallucinations are vivid, substantial, and are perceived to be located in external objective space. Hallucination is a combinatio ...
s, because the person undergoing the experience can still distinguish between real and imagined visual phenomena, though in some cases, true hallucinations are present. More rarely, psychedelic experiences can include complex hallucinations of objects, animals, people, or even whole landscapes. Visual alterations also include other effects such as
afterimage AfterImage is a Filipino rock band formed in 1986, best known for their songs "Habang May Buhay", "Next in Line", and "Mangarap Ka". They disbanded in 1997 and became active again in 2008 after they reunited and released their fourth studio album ...
s, shifting of color hues, and
pareidolia Pareidolia (; ) is the tendency for perception to impose a meaningful interpretation on a nebulous stimulus, usually visual, so that one sees an object, pattern, or meaning where there is none. Common examples are perceived images of animals, ...
.


Mystical experiences

A number of studies by
Roland R. Griffiths Roland Redmond Griffiths (born 1946) is an American psychopharmacologist. He is professor of neuroscience, psychiatry, and behavioral science, and director of the Center for Psychedelic and Consciousness Research at Johns Hopkins University Sch ...
and other researchers have concluded that high doses of
psilocybin Psilocybin ( , ) is a naturally occurring psychedelic prodrug compound produced by more than 200 species of fungi. The most potent are members of the genus ''Psilocybe'', such as '' P. azurescens'', '' P. semilanceata'', and '' P.&nbs ...
and other classic psychedelics trigger mystical experiences in most research participants. Mystical experiences have been measured by a number of
psychometric Psychometrics is a field of study within psychology concerned with the theory and technique of measurement. Psychometrics generally refers to specialized fields within psychology and education devoted to testing, measurement, assessment, and ...
scales, including the
Hood Hood may refer to: Covering Apparel * Hood (headgear), type of head covering ** Article of Academic dress#Hood, academic dress ** Bondage hood, sex toy * Hoodie, hooded sweatshirt Anatomy * Clitoral hood, a hood of skin surrounding the clitori ...
Mysticism Scale, the Spiritual Transcendence Scale, and the Mystical Experience Questionnaire. The revised version of the Mystical Experience Questionnaire, for example, asks participants about four dimensions of their experience, namely the "mystical" quality, positive mood such as the experience of amazement, the loss of the usual sense of time and space, and the sense that the experience cannot be adequately conveyed through words. The questions on the "mystical" quality in turn probe multiple aspects: the sense of "pure" being, the sense of unity with one's surroundings, the sense that what one experienced was real, and the sense of sacredness. Some researchers have questioned the interpretation of the results from these studies and whether the framework and terminology of mysticism are appropriate in a scientific context, while other researchers have responded to those criticisms and argued that descriptions of mystical experiences are compatible with a scientific worldview. A group of researchers concluded in a 2011 study that psilocybin "occasions personally and spiritually significant mystical experiences that predict long-term changes in behaviors, attitudes and values". Some research has found similarities between psychedelic experiences and non-ordinary forms of consciousness experienced in
meditation Meditation is a practice in which an individual uses a technique – such as mindfulness, or focusing the mind on a particular object, thought, or activity – to train attention and awareness, and achieve a mentally clear and emotionally cal ...
and
near-death experience A near-death experience (NDE) is a profound personal experience associated with death or impending death which researchers claim share similar characteristics. When positive, such experiences may encompass a variety of sensations including detac ...
s. The phenomenon of ego dissolution is often described as a key feature of the psychedelic experience. Individuals who have psychedelic experiences often describe what they experienced as "more real" than ordinary experience. For example, the psychologist
Benny Shanon Benny Shanon ( he, בני שנון; born 1948) is an emeriti professor of psychology at the Hebrew University of Jerusalem and holds the Mandel Chair in cognitive psychology and education. Born in Tel Aviv, Shanon studied philosophy and linguistics ...
, after observing
ayahuasca AyahuascaPronounced as in the UK and in the US. Also occasionally known in English as ''ayaguasca'' (Spanish-derived), ''aioasca'' (Brazilian Portuguese-derived), or as ''yagé'', pronounced or . Etymologically, all forms but ''yagé'' descen ...
trips, referred to "the assessment, very common with ayahuasca, that what is seen and thought during the course of intoxication defines the real, whereas the world that is ordinarily perceived is actually an illusion." Similarly, the psychiatrist
Stanislav Grof Stanislav "Stan" Grof is a Czech-born psychiatrist who has been living in the United States since the 1960s. Grof is one of the principal developers of transpersonal psychology and research into the use of non-ordinary states of consciousness ...
described the LSD experience as "complex revelatory insights into the nature of existence… typically accompanied by a sense of certainty that this knowledge is ultimately more relevant and 'real' than the perceptions and beliefs we share in everyday life."


Bad trips

A "bad trip" is a highly unpleasant psychedelic experience. A bad trip on psilocybin, for instance, often features intense anxiety, confusion, and agitation, or even
psychotic Psychosis is a condition of the mind that results in difficulties determining what is real and what is not real. Symptoms may include delusions and hallucinations, among other features. Additional symptoms are incoherent speech and behavior ...
episodes. Bad trips can be connected to the anxious ego-dissolution (AED) dimension of the
APZ questionnaire The APZ (Abnormal Mental States) questionnaire is one of the most widely used psychometric scales for assessing subjective experiences of altered states of consciousness An altered state of consciousness (ASC), also called altered state of mind ...
used in research on psychedelic experiences. As of 2011, exact data on the frequency of bad trips are not available. Some research suggests that the risk of a bad trip on psilocybin is higher when multiple drugs are used, when the user has a history of certain mental illnesses, and when the user is not supervised by a sober person. In clinical research settings, precautions including the screening and preparation of participants, the training of the session monitors who will be present during the experience, and the selection of appropriate physical setting can minimize the likelihood of psychological distress. Researchers have suggested that the presence of professional "
trip sitter A trip sitter—sometimes known as a sober sitter, spotter, or co-pilot—is a term used by recreational or spiritual drug users to describe a person who remains sober to ensure the safety of the drug user while they are under the influence of a ...
s" (i.e., session monitors) may significantly reduce the negative experiences associated with a bad trip. In most cases in which anxiety arises during a supervised psychedelic experience, reassurance from the session monitor is adequate to resolve it; however, if distress becomes intense it can be treated pharmacologically, for example with the
benzodiazepine Benzodiazepines (BZD, BDZ, BZs), sometimes called "benzos", are a class of depressant drugs whose core chemical structure is the fusion of a benzene ring and a diazepine ring. They are prescribed to treat conditions such as anxiety disorders, ...
diazepam Diazepam, first marketed as Valium, is a medicine of the benzodiazepine family that acts as an anxiolytic. It is commonly used to treat a range of conditions, including anxiety, seizures, alcohol withdrawal syndrome, muscle spasms, insomnia, a ...
. The psychiatrist
Stanislav Grof Stanislav "Stan" Grof is a Czech-born psychiatrist who has been living in the United States since the 1960s. Grof is one of the principal developers of transpersonal psychology and research into the use of non-ordinary states of consciousness ...
wrote that unpleasant psychedelic experiences are not necessarily unhealthy or undesirable, arguing that they may have potential for psychological healing and lead to breakthrough and resolution of unresolved psychic issues. Drawing on
narrative theory A narrative, story, or tale is any account of a series of related events or experiences, whether nonfictional (memoir, biography, news report, documentary, travel literature, travelogue, etc.) or fictional (fairy tale, fable, legend, thriller (ge ...
, the authors of a 2021 study of 50 users of psychedelics found that many described bad trips as having been sources of insight or even turning points in life.


Scientific models

Link R. Swanson divides scientific frameworks for understanding psychedelic experiences into two waves. In the first wave, encompassing nineteenth- and twentieth-century frameworks, he includes model
psychosis Psychosis is a condition of the mind that results in difficulties determining what is real and what is not real. Symptoms may include delusions and hallucinations, among other features. Additional symptoms are incoherent speech and behavior ...
theory (the
psychotomimetic A drug with psychotomimetic (also known as psychotogenic) actions mimics the symptoms of psychosis, including delusions and/or delirium, as opposed to only hallucinations. Psychotomimesis is the onset of psychotic symptoms following the administrat ...
paradigm), filtration theory, and
psychoanalytic theory Psychoanalytic theory is the theory of personality organization and the dynamics of personality development that guides psychoanalysis, a clinical method for treating psychopathology. First laid out by Sigmund Freud in the late 19th century, psyc ...
. In the second wave of theories, encompassing twenty-first-century frameworks, Swanson includes entropic brain theory,
integrated information theory Integrated information theory (IIT) attempts to provide a framework capable of explaining why some physical systems (such as human brains) are conscious, why they feel the particular way they do in particular states (e.g. why our visual field appe ...
, and predictive processing.


Model psychosis theory

Researchers studying mescaline in the early twentieth century and LSD in the mid-twentieth century took interest in these drugs as producing a temporary "model psychosis" that could assist researchers and medical students in understanding the experiences of patients with
schizophrenia Schizophrenia is a mental disorder characterized by continuous or relapsing episodes of psychosis. Major symptoms include hallucinations (typically hearing voices), delusions, and disorganized thinking. Other symptoms include social withdra ...
and other psychotic disorders.


Filtration theory

Aldous Huxley Aldous Leonard Huxley (26 July 1894 – 22 November 1963) was an English writer and philosopher. He wrote nearly 50 books, both novels and non-fiction works, as well as wide-ranging essays, narratives, and poems. Born into the prominent Huxley ...
and
Humphrey Osmond Humphry Fortescue Osmond (1 July 1917 – 6 February 2004) was an English psychiatrist who expatriated to Canada, then moved to work in the United States. He is known for inventing the word ''psychedelic'' and for his research into interesting a ...
applied the pre-existing ideas of filtration theory, which held that the brain filters what enters into consciousness, to explain psychedelic experiences (and it is from this paradigm that the term ''psychedelic'' is derived). Huxley believed that the brain was filtering reality itself and that psychedelics granted conscious access to "
Mind at Large Mind at Large is a concept proposed by Aldous Huxley to help interpret psychedelic experience. He maintained that the human mind filters reality under normal circumstances and that psychedelic drugs remove the filter, exposing the user to a Mind at ...
," whereas Osmond believed that the brain was filtering aspects of the mind out of consciousness. Swanson writes that Osmond's view seems "less radical, more compatible with
materialist Materialism is a form of philosophical monism which holds matter to be the fundamental substance in nature, and all things, including mental states and consciousness, are results of material interactions. According to philosophical materialis ...
science, and less epistemically and
ontologically In metaphysics, ontology is the philosophical study of being, as well as related concepts such as existence, becoming, and reality. Ontology addresses questions like how entities are grouped into categories and which of these entities exis ...
committed" than Huxley's.


Psychoanalytic theory

Psychoanalytic theory was the predominant interpretive framework in mid-twentieth-century psychedelic-assisted psychotherapy. For instance, Czech psychiatrist
Stanislav Grof Stanislav "Stan" Grof is a Czech-born psychiatrist who has been living in the United States since the 1960s. Grof is one of the principal developers of transpersonal psychology and research into the use of non-ordinary states of consciousness ...
characterised psychedelic experiencing as "non-specific amplification of unconscious mental processes", and he analysed the phenomenology of the LSD experience (particularly the experience of what he termed psychospiritual death and rebirth) in terms of
Otto Rank Otto Rank (; ; né Rosenfeld; 22 April 1884 – 31 October 1939) was an Austrian psychoanalyst, writer, and philosopher. Born in Vienna, he was one of Sigmund Freud's closest colleagues for 20 years, a prolific writer on psychoanalytic themes, ...
's theory of the unresolved memory of the primal birth trauma.


Entropic brain theory

Entropic brain theory is a theory of
consciousness Consciousness, at its simplest, is sentience and awareness of internal and external existence. However, the lack of definitions has led to millennia of analyses, explanations and debates by philosophers, theologians, linguisticians, and scien ...
proposed in 2014 by neuroscientist Robin Carhart-Harris and colleagues that was inspired by research on psychedelic drugs.


Integrated information theory

Integrated information theory is a theory of consciousness proposing to explain all forms of consciousness, and has been applied specifically to psychedelic experiences by Andrew Gallimore.


Predictive processing

Sarit Pink-Hashkes and colleagues have applied the predictive processing paradigm in neuroscience to psychedelic experiences in order to formalize the idea of the entropic brain.


In religious and spiritual contexts

Alan Watts Alan Wilson Watts (6 January 1915 – 16 November 1973) was an English writer, speaker and self-styled "philosophical entertainer", known for interpreting and popularising Japanese, Chinese and Indian traditions of Buddhist, Taoist, and Hindu ...
likened psychedelic experiencing to the transformations of consciousness that are undertaken in
Taoism Taoism (, ) or Daoism () refers to either a school of Philosophy, philosophical thought (道家; ''daojia'') or to a religion (道教; ''daojiao''), both of which share ideas and concepts of China, Chinese origin and emphasize living in harmo ...
and
Zen Zen ( zh, t=禪, p=Chán; ja, text= 禅, translit=zen; ko, text=선, translit=Seon; vi, text=Thiền) is a school of Mahayana Buddhism that originated in China during the Tang dynasty, known as the Chan School (''Chánzong'' 禪宗), and ...
, which he says is, "more like the correction of faulty perception or the curing of a disease… not an acquisitive process of learning more and more facts or greater and greater skills, but rather an unlearning of wrong habits and opinions." Watts further described the LSD experience as, "revelations of the secret workings of the brain, of the associative and patterning processes, the ordering systems which carry out all our sensing and thinking." According to Luis Luna, psychedelic experiences have a distinctly
gnosis Gnosis is the common Greek noun for knowledge ( γνῶσις, ''gnōsis'', f.). The term was used among various Hellenistic religions and philosophies in the Greco-Roman world. It is best known for its implication within Gnosticism, where it ...
-like quality; it is a learning experience that elevates consciousness and makes a profound contribution to personal development. For this reason, the plant sources of some psychedelic drugs such as ayahuasca and mescaline-containing cacti are sometimes referred to as "plant teachers" by those using those drugs. Furthermore, psychedelic drugs have a history of religious use across the world that extends back for hundreds or perhaps thousands of years. They are often called
entheogens Entheogens are psychoactive substances that induce alterations in perception, mood, consciousness, cognition, or behavior for the purposes of engendering spiritual development or otherwiseRätsch, Christian, ''The Encyclopedia of Psychoacti ...
because of the kinds of experiences they can induce. Some small contemporary religious movements base their religious activities and beliefs around psychedelic experiences, such as
Santo Daime Santo Daime () is a syncretic religion founded in the 1930s in the Brazilian Amazonian state of Acre by Raimundo Irineu Serra, known as Mestre Irineu. Santo Daime incorporates elements of several religious or spiritual traditions including Folk ...
and the
Native American Church The Native American Church (NAC), also known as Peyotism and Peyote Religion, is a Native American religion that teaches a combination of traditional Native American beliefs and Christianity, with sacramental use of the entheogen peyote. The re ...
.


See also

*
APZ questionnaire The APZ (Abnormal Mental States) questionnaire is one of the most widely used psychometric scales for assessing subjective experiences of altered states of consciousness An altered state of consciousness (ASC), also called altered state of mind ...
*
Cannabis and time perception The effect of cannabis on time perception has been studied with inconclusive results. Studies show consistently throughout the literature that most cannabis users self-report the experience of a slowed perception of time. In the laboratory, resear ...
*
Default mode network In neuroscience, the default mode network (DMN), also known as the default network, default state network, or anatomically the medial frontoparietal network (M-FPN), is a large-scale brain network primarily composed of the dorsal medial prefro ...
*
Eight-circuit model of consciousness The eight-circuit model of consciousness is a holistic model originally described by Timothy Leary, later expanded on by Robert Anton Wilson and Antero Alli, that suggests "eight periods ircuitsand twenty-four stages of neurological evolution". ...
*
Numinous Numinous () is a term derived from the Latin ''numen'', meaning "arousing spiritual or religious emotion; mysterious or awe-inspiring."Collins English Dictionary -7th ed. - 2005 The term was given its present sense by the German theologian and ph ...
experience *
Philosophy of psychedelics Philosophy of psychedelics is the philosophical investigation of the psychedelic experience. While psychedelic, entheogenic or hallucinogenic substances have been used by many traditional cultures throughout history mostly for religious purposes ...
*
Psychedelic microdosing Psychedelic microdosing is the practice of using sub-threshold doses (microdoses) of serotonergic psychedelic drugs in an attempt to improve creativity, boost physical energy level, promote emotional balance, increase performance on problems-solv ...
*
Psychonautics Psychonautics (from the Ancient Greek ' 'soul, spirit, mind' and ' 'sailor, navigator') refers both to a methodology for describing and explaining the subjective effects of altered states of consciousness, including those induced by meditatio ...


References


Further reading

* Grinspoon, Lester, & Bakalar, James. B. (Eds.). ''Psychedelic Reflections''. (1983). New York: Human Sciences Press. p. 13-14 * * * {{DEFAULTSORT:Psychedelic Experience Hallucinations Psychedelia de:Trip