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Altered states of consciousness research: what the evidence shows

The broad landscape of consciousness that departs from ordinary waking awareness, however induced.

State of the evidence

Synthesized

Synthesized from 22 studies in the library · AI-generated, grounded in the abstracts below

Found by searching the library for Altered states of consciousness, non-ordinary states, altered consciousness, ASC, then ranked by relevance.

Research on altered states of consciousness (ASCs) is dominated by psychometric and neuroimaging work rather than by trials of a single intervention. Across induction methods, ASCs appear to share a small set of dimensions (e.g., oceanic boundlessness, dread of ego dissolution, visionary restructuralization) and a common neural pattern of reduced default-mode and prefrontal activity with altered thalamic and sensory engagement, though the meta-analytic effects are largely exploratory and uncorrected. Small mechanistic studies show that psychedelic-induced ASCs depend on 5-HT2A receptor activation and track oscillatory and connectivity changes. The main caveats are small samples, mostly healthy volunteers, and limited evidence on durability or clinical outcomes.

Evidence by study

Direction is which way each study's own result points, not our rating of the study. All 25 matching studies were reviewed; the 22 that directly address the question are shown here.

What the directions mean
Supports:
the study found the intervention worked, or its hypothesis held.
Opposes:
it found the opposite, no benefit or a harm.
No effect:
no significant difference either way.
Mixed:
effects in both directions within the same study.
Unclear:
the abstract does not report a direction.
Study Design Sample size Direction Finding
Psychometric Evaluation of the Altered States of Consciousness Rating Scale (OAV) 2010 psychometric study Supports Eleven new lower-order scales for the OAV showed desirable psychometric properties and are proposed as better suited for assessing drug-induced altered states.
Altered States of Consciousness 1966 theoretical Unclear Argues that scattered knowledge on altered states should be integrated into a consistent theoretical system covering their emergence, manifestations, commonalities, and functions.
The Standardized Psychometric Assessment of Altered States of Consciousness (ASCs) in Humans 1998 experimental and field study 1133 Supports Across induction methods, altered states shared three oblique dimensions (Oceanic Boundlessness, Dread of Ego Dissolution, Visionary Restructuralization), corroborated in field studies.
The Subjective Effects of Psychedelics Are Necessary for Their Enduring Therapeutic Effects. 2020 review Supports Argues that the subjective effects of psychedelics are necessary for their enduring therapeutic benefits and account for most of those benefits.
Functional neuroanatomy of altered states of consciousness: The transient hypofrontality hypothesis 2003 theoretical Unclear Proposes that transient prefrontal cortex deregulation is the unifying feature of altered states, with each state's uniqueness arising from differential viability of frontal circuits.
Psychobiology of Altered States of Consciousness. 2005 review Supports Characterizes altered states along four dimensions (activation, awareness span, self-awareness, sensory dynamics) and links them to compromised brain structure, transient disconnectivity, and neurochemical/metabolic processes.
Changes in global and thalamic brain connectivity in LSD-induced altered states of consciousness are attributable to the 5-HT2A receptor 2018 RCT (double-blind, randomized, counterbalanced, cross-over) 24 Supports LSD reduced associative but increased sensory-somatomotor and thalamic connectivity, and ketanserin fully blocked both the subjective and neural LSD effects, implicating the 5-HT2A receptor.
Intrinsic Brain Activity in Altered States of Consciousness 2008 review Mixed Coherent spontaneous BOLD fluctuations, especially in the default-mode network, persist in several unconscious states, suggesting they are not exclusive to conscious mental activity, while associative fronto-parieto-cingulate areas are systematically impaired in altered states.
Neural correlates of the DMT experience assessed with multivariate EEG. 2019 observational cohort 13 Supports DMT reduced alpha and beta oscillatory power and increased signal diversity, with delta and theta activity correlating with the peak of the subjective visual experience.
Effective connectivity changes in LSD-induced altered states of consciousness in humans. 2019 RCT (double-blind, randomized, placebo-controlled, cross-over) 25 Supports LSD increased effective connectivity from thalamus to posterior cingulate cortex via serotonin 2A receptor activation and decreased ventral striatum-to-thalamus connectivity independently of those receptors.
Brain sources of EEG gamma frequency during volitionally meditation-induced, altered states of consciousness, and experience of the self 2001 case study 1 Supports Different self-induced meditation states were associated with significantly different locations of EEG gamma-band sources, indicating distinct active neuronal populations across subjective states.
Dynamic functional connectivity and brain metastability during altered states of consciousness 2017 review Supports Dynamic neuroimaging shows non-trivial temporal structure compatible with a discrete repertoire of brain states, supporting a dynamic core account of consciousness that may be modified during altered states.
A neurophenomenological approach to non-ordinary states of consciousness: hypnosis, meditation, and psychedelics 2022 theoretical Unclear Proposes a neurophenomenological framework for non-ordinary states (hypnosis, meditation, psychedelics) as catalysts of transformation, linking experiential and neural dynamics.
Non-Verbal Behavior as a Marker of Altered States of Consciousness in a Literary Piece 2026 qualitative (literary analysis) Unclear Analyzes non-verbal behavior and its linguistic correlates as markers of altered states in a literary character, noting that such signs often go undeciphered by others.
Functional changes in brain activity in altered states of consciousness : An SDM-PSI comparative systematic review and meta-analysis 2026 meta-analysis (coordinate-based, SDM-PSI) 961 Mixed At exploratory significance, all altered-state categories showed decreased default-mode hub activity with greater salience and executive engagement; only meditation effects survived correction, and psychedelics additionally involved visual and thalamic circuits.
Sync × Coverage: A Cross-Dataset EEG Biomarker for Deep Meditative and Altered States of Consciousness 2026 preprint (cross-dataset EEG validation) 328 Supports Reports a two-dimensional EEG signature (Sync x Coverage) that separates deep meditative states from sleep, anesthesia, and disorders of consciousness across six datasets.
Psychonautic Benchmarking: Towards Standardized Expertise Criteria in Non-Ordinary States Research 2026 theoretical Unclear Argues that psychoactive-substance research lacks systematic participant-expertise classification and proposes an unvalidated multidimensional psychonaut benchmarking framework with two proposed instruments.
Placebo-induced Altered States of Consciousness – A Proof-of-Concept Study of a Psychedelic Placebo Intervention 2026 RCT 38 Supports A multi-component placebo intervention reliably induced altered-state experiences in a psychedelic-therapy-like setting, with room environment not modulating intensity and no variable reliably predicting self-reported intensity.
Cannabis Is a Psychedelic, and a Beneficial One at That - The Overlooked Cannabinoid Path Into Altered Consciousness 2026 theoretical Unclear Argues that cannabis is pharmacologically atypical but phenomenologically psychedelic, capable of marked perceptual and self-experience alterations and sometimes mystical states, with established medical uses and notable risks.
La nozione di moto nelle concettualizzazioni degli stati di sonno, sogno, meditazione e ipnosi nella lingua italiana 2026 theoretical (linguistic analysis) Unclear Argues that Italian conceptualizations of sleep, dreaming, meditation, and hypnosis differ in how they portray movement, the experiencer's role, and boundaries.
Immersive virtual reality: distinct impact on altered states of consciousness 2026 controlled experiment 70 Supports The VR group scored significantly higher than the screen group on all MEQ30 dimensions, indicating that immersive VR can elicit mystical-type experiences.
A testable theoretical framework linking cranial osteopathic still-point induction to altered consciousness via convergent autonomic, default-mode, and interoceptive mechanisms. 2026 theoretical Unclear Proposes a falsifiable framework in which cranial osteopathic still-point induction may transiently reconfigure self-referential mental content and interoceptive salience via convergent autonomic, default-mode, and interoceptive mechanisms, based on indirect evidence.

Points of agreement

  • Altered states can be induced by many methods (psychedelics, meditation, hypnosis, VR, placebo) and share common phenomenological dimensions.
  • Neuroimaging across states points to reduced default-mode/prefrontal activity with altered thalamic and sensory engagement.
  • Psychedelic-induced altered states depend critically on 5-HT2A receptor activation.
  • Subjective experience is closely coupled to measurable brain dynamics (oscillatory power, signal diversity, connectivity).

Conflicts

  • Some accounts treat ASCs as a single unified phenomenon (e.g., transient hypofrontality), while others emphasize state-specific and etiology-dependent dimensions.
  • Meta-analytic neural convergence is described as candidate-level and exploratory, whereas individual mechanistic studies report robust receptor-specific effects.
  • Whether spontaneous resting-state activity reflects conscious content or default connectivity remains contested.

Gaps

  • Most mechanistic studies use small samples of healthy volunteers.
  • Durability and clinical outcomes of induced altered states are largely unstudied.
  • Blinding and expectancy effects are poorly controlled, as placebo can itself induce ASCs.
  • Dose-response relationships and comparisons across induction methods are limited.
  • Several proposed frameworks and instruments remain unvalidated.
Browse these studies in the library

Common questions

What does the research agree on about altered states of consciousness?
  • Altered states can be induced by many methods (psychedelics, meditation, hypnosis, VR, placebo) and share common phenomenological dimensions.
  • Neuroimaging across states points to reduced default-mode/prefrontal activity with altered thalamic and sensory engagement.
  • Psychedelic-induced altered states depend critically on 5-HT2A receptor activation.
  • Subjective experience is closely coupled to measurable brain dynamics (oscillatory power, signal diversity, connectivity).
Where do studies on altered states of consciousness conflict?
  • Some accounts treat ASCs as a single unified phenomenon (e.g., transient hypofrontality), while others emphasize state-specific and etiology-dependent dimensions.
  • Meta-analytic neural convergence is described as candidate-level and exploratory, whereas individual mechanistic studies report robust receptor-specific effects.
  • Whether spontaneous resting-state activity reflects conscious content or default connectivity remains contested.
What is still unknown about altered states of consciousness?
  • Most mechanistic studies use small samples of healthy volunteers.
  • Durability and clinical outcomes of induced altered states are largely unstudied.
  • Blinding and expectancy effects are poorly controlled, as placebo can itself induce ASCs.
  • Dose-response relationships and comparisons across induction methods are limited.
  • Several proposed frameworks and instruments remain unvalidated.
How we analyze this

This synthesis reads the 15 most-cited and 10 most recent studies whose primary subject is Altered states of consciousness, up to 25 in all. The most-cited set anchors the established evidence, and the recent set surfaces work that is too new to have gathered citations yet.

A study qualifies only when Altered states of consciousness or a known alias appears in its title or keywords, so broad reviews that mention it only in passing are left out. Each study is read from its abstract, strongest evidence first, and the summary reports the direction of the results along with any conflicts and gaps.

The full method, including what a person does and does not review, is on the methods page.

Ask your own question in the Research Synthesis Tool

Latest monthly recap: October 2026 →

2,708 articles · 837 from the last two years · 217,520 participants across 747 studies reporting sample size

Common study designs

review 348 experimental study 89 observational study 90 observational cohort 151 theoretical or philosophical paper 922

Research volume by year

Compare topics →

368 studies whose primary subject is altered states of consciousness since 2002

Studies about altered states of consciousness per year, 2002 to 2026, peaking at 53 in 2026 Bar chart: one bar per year, taller where more studies were published that year. 0 30 60 2005 2010 2015 2020 2025
2026 is partial
Show the numbers
Studies about altered states of consciousness per year, 2002 to 2026, peaking at 53 in 2026
Year Studies
2002 5
2003 2
2004 2
2005 6
2006 4
2007 2
2008 2
2009 8
2010 6
2011 11
2012 3
2013 5
2014 6
2015 11
2016 7
2017 13
2018 17
2019 29
2020 20
2021 13
2022 32
2023 23
2024 44
2025 44
2026 53

Research

Synthesize the evidence → Search all →

Beyond self, time, and space: exceptional experiences and altered states of consciousness

Frontiers in Psychology November 6, 2026 Marc Wittmann

Exceptional experiences commonly described as parapsychological or as extra-sensory—including precognition, telepathic impressions, meaningful coincidences, and other forms of anomalous cognition—remain among the most controversial topics in consciousness research. Population studies consistently demonstrate that such experiences are widespread across cultures and appear to transcend ordinary...

DOI: 10.3389/fpsyg.2026.1980354 (opens in new tab)

Altered states of consciousness, intuition, and the sensation of déjà vu

Psychiatria i Psychologia Kliniczna October 29, 2026 Liana Spytska

Introduction and objective: Altered states of consciousness, intuition, and the sensation of déjà vu reveal various aspects and possibilities of human consciousness. Studying these phenomena is relevant today, as it helps understand how the human mental system operates, what processes occur in the brain, and how they affect the perception of reality. The purpose of this study is to examine the...

DOI: 10.15557/pipk.2026.0036 (opens in new tab)

Non-Verbal Behavior as a Marker of Altered States of Consciousness in a Literary Piece

RUDN Journal of Language Studies, Semiotics and Semantics October 13, 2026 Vera V. Ganina, Faina I. Kartashkova

The problem of altered states of consciousness from linguistic angle is relevant. Attention is focused on the ways in which altered states of consciousness are reflected in a literary piece. The research is delivered on the basis of Dostoevsky’s novel “Crime and Punishment”. Different types of non-verbal behavior of the main character and the language correlates are discussed. It is...

DOI: 10.22363/2313-2299-2026-17-2-796-812 (opens in new tab) Full text (opens in new tab) Emotions Communicative behavior Non-verbal behavior Linguistic correlations +1

Functional changes in brain activity in altered states of consciousness : An SDM-PSI comparative systematic review and meta-analysis

Cortica October 10, 2026 Ayla Gay

Altered states of consciousness (ASCs) induced by psychological practices (mindfulness meditation, hypnosis, self-induced trance) and pharmacological agents (classical and atypical psychedelics) are increasingly linked to therapeutic change, yet their shared and unique neural signatures remain uncertain. We conducted three preregistered, coordinate-based meta-analyses using SDM-PSI, mindfulness...

DOI: 10.26034/cortica.2026.11667 (opens in new tab) Full text (opens in new tab) Meditation

Sync × Coverage: A Cross-Dataset EEG Biomarker for Deep Meditative and Altered States of Consciousness

Zenodo (CERN European Organization for Nuclear Research) October 7, 2026 Qiao Ou preprint

Sync × Coverage: A Cross-Dataset EEG Signature for Deep Meditative States Author: Qiao Ou (ORCID 0009-0008-4540-1381)Date: 2026-10-08Version: 1.0 --- Abstract We report a two-dimensional EEG signature — Sync × Coverage — that separates deep meditative states from sleep, anesthesia, and disorders of consciousness. The signature is validated across six independent public datasets totaling 328...

DOI: 10.5281/zenodo.23220314 (opens in new tab)

Psychonautic Benchmarking: Towards Standardized Expertise Criteria in Non-Ordinary States Research

October 3, 2026 Juliana Estévez, David Lameiras, Giancarlo Allocca et al. preprint

This paper addresses a methodological disparity between meditation research and research involving psychoactive substances. Studies of meditation routinely apply established criteria to distinguish expert practitioners from novices, while research with psychoactive substances screens for safety rather than classifying expertise. We analyze current benchmarking practice in meditation research,...

DOI: 10.31234/osf.io/zuwxc_v1 (opens in new tab)

Placebo-induced Altered States of Consciousness – A Proof-of-Concept Study of a Psychedelic Placebo Intervention

Psychology Archives September 16, 2026 Lukas A Basedow, Andreas Reis, Irina Falkenberg et al.

The intensity of altered states of consciousness (ASC) induced by a psychedelic represents a key mechanism underlying the therapeutic effects of psychedelic-assisted therapy (PAT). However, growing evidence suggests that expectations may contribute significantly to therapeutic effects of PAT. The present study examined whether a psychedelic placebo could induce an ASC in a PAT- analogous...

DOI: 10.23668/psycharchives.22499 (opens in new tab)

Cannabis Is a Psychedelic, and a Beneficial One at That - The Overlooked Cannabinoid Path Into Altered Consciousness

Zenodo (CERN European Organization for Nuclear Research) September 7, 2026 Christian Alexander Brown preprint

This research essay/article argues that cannabis can reasonably be described as psychedelic in a phenomenological sense, even though it is not pharmacologically classified as a classic serotonergic psychedelic such as LSD or psilocybin. The central distinction is between pharmacology and phenomenology: THC acts primarily through the endocannabinoid system, especially CB1 receptor signaling, yet...

DOI: 10.5281/zenodo.22654692 (opens in new tab)

Immersive virtual reality: distinct impact on altered states of consciousness

Virtual Reality August 25, 2026 Liat Abouhav, Keren Nitzan, Ravid Doron

Abstract As mental health challenges continue to rise, there is increasing interest in interventions that promote psychological change through emotionally and experientially rich states. One well-studied example involves mystical-type experiences, typically reported in psychedelic-assisted interventions. Virtual reality (VR), with its immersive and embodied qualities, has emerged as a promising...

DOI: 10.1007/s10055-026-01443-x (opens in new tab)

Clinical trials

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