Psilocybin

Validation of the revised Mystical Experience Questionnaire in experimental sessions with psilocybin

This meta-analysis (2015) validates the Mystical Experience Questionnaire (MEQ30) using data from five experimental studies (n=184) with controlled doses of psilocybin (20mg/70kg).

Authors

  • Roland Griffiths
  • Matthew Johnson
  • Frederick Barrett

Published

Journal of Psychopharmacology
meta Study

Abstract

The 30-item revised Mystical Experience Questionnaire (MEQ30) was previously developed within an online survey of mystical-type experiences occasioned by psilocybin-containing mushrooms. The rated experiences occurred on average eight years before completion of the questionnaire. The current paper validates the MEQ30 using data from experimental studies with controlled doses of psilocybin. Data were pooled and analyzed from five laboratory experiments in which participants (n=184) received a moderate to high oral dose of psilocybin (at least 20 mg/70 kg). Results of confirmatory factor analysis demonstrate the reliability and internal validity of the MEQ30. Structural equation models demonstrate the external and convergent validity of the MEQ30 by showing that latent variable scores on the MEQ30 positively predict persisting change in attitudes, behavior, and well-being attributed to experiences with psilocybin while controlling for the contribution of the participant-rated intensity of drug effects. These findings support the use of the MEQ30 as an efficient measure of individual mystical experiences. A method to score a “complete mystical experience” that was used in previous versions of the mystical experience questionnaire is validated in the MEQ30, and a stand-alone version of the MEQ30 is provided for use in future research.

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Research Summary of 'Validation of the revised Mystical Experience Questionnaire in experimental sessions with psilocybin'

Introduction

Reports of mystical-type experiences describe common dimensions such as a felt unity with all that exists, sacredness, noetic quality (a sense of encountering fundamental truth), intense positive mood, transcendence of time and space, and ineffability. Earlier versions of the Mystical Experience Questionnaire (MEQ), most notably the 43-item MEQ43, were developed to quantify these dimensions in single, discrete experiences occasioned by classic hallucinogens and have been used in prospective studies of psilocybin; however, psychometric investigation of the MEQ43 has been limited. A 30-item revised instrument (MEQ30) was previously derived from retrospective online reports of psilocybin-related experiences and modelled into four factors (mystical, positive mood, transcendence of time and space, and ineffability), but that work relied on uncontrolled, retrospective data collected on average eight years after the original experiences. This paper aims to validate the MEQ30 in prospectively collected experimental data. Barrett and colleagues pooled data from five laboratory studies in which participants (n=184) received a moderate to high oral dose of psilocybin (at least 20 mg/70 kg) and used confirmatory factor analysis and structural equation modelling to test the MEQ30 factor structure, examine relationships between MEQ30 latent scores and persisting outcomes attributed to the session while controlling for overall drug intensity, and adapt a dichotomous "complete mystical experience" scoring method from the MEQ43 to the MEQ30. The study therefore evaluates internal, external and convergent validity of the MEQ30 in controlled-dose psilocybin sessions.

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Study Details

References (5)

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79 cited
Safety, tolerability, pharmacokinetics, and subjective effects of 50, 75, and 100 µg LSD in healthy participants within a novel intervention paradigm: A proof-of-concept study

Family, N., Hendricks, P. S., Williams, L. T. J. et al. · Journal of Psychopharmacology (2022)

Psilocybin induces spatially constrained alterations in thalamic functional organization and connectivity

Gaddis, A., Lidstone, D. E., Nebel, M. B. et al. · Biorxiv (2022)

Direct comparison of the acute effects of lysergic acid diethylamide and psilocybin in a double-blind placebo-controlled study in healthy subjects

Holze, F., Ley, L., Müller, F. et al. · Neuropsychopharmacology (2022)

169 cited
Ayahuasca and tobacco smoking cessation: results from an online survey in Brazil

Maia, L. O., Massarentti, C. M., Tófoli, L.F. · Psychopharmacology (2022)

28 cited
Efficacy and safety of psilocybin-assisted treatment for major depressive disorder: Prospective 12-month follow-up

Davis, A. K., Streeter Barrett, F., Cosimano, M. P. et al. · Journal of Psychopharmacology (2022)

306 cited
The clinical pharmacology and potential therapeutic applications of 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT)

Reckweg, J., Uthaug, M. V., Szabo, A. et al. · Journal of Neurochemistry (2022)

The moderating role of mystical-type experiences on the relationship between existential isolation and meaning in life

Sielaff, A., Horner, D. E., Greenberg, J. · Personality and Individual Differences (2022)

Classic Psychedelic Drugs: Update on Biological Mechanisms

Vollenweider, F. X., Smallridge, J. W. · Pharmacopsychiatry (2022)

71 cited
Human Cortical Serotonin 2A Receptor Occupancy by Psilocybin Measured Using [11C]MDL 100,907 Dynamic PET and a Resting-State fMRI-Based Brain Parcellation

Barrett, F. S., Zhou, Y., Carbonaro, T. M. et al. · Frontiers in Neuroergonomics (2022)

Validation of the Psychological Insight Scale: A new scale to assess psychological insight following a psychedelic experience

Peill, J. M., Trinci, K. E., Kettner, H. et al. · Journal of Psychopharmacology (2022)

Human behavioral pharmacology of psychedelics

Strickland, J. C., Johnson, M. W. · Advances in Pharmacology (2022)

5 cited
A Spectrum of Selves Reinforced in Multilevel Coherence: A Contextual Behavioural Response to the Challenges of Psychedelic-Assisted Therapy Development

Whitfield, H. J. · Frontiers in Psychiatry (2021)

Classic psychedelics in the treatment of substance use disorder: Potential synergies with twelve-step programs

Yaden, D. B., Berghella, A. P., Regier, P. S. et al. · International Journal of Drug Policy (2021)

41 cited
Recreational Psychedelic Users Frequently Encounter Complete Mystical Experiences: Trip Content and Implications for Wellbeing

Qiu, X., Minda, J. P. · Psyarxiv (2021)

5 cited
A phase 1, dose-ranging study to assess safety and psychoactive effects of a vaporized 5-methoxy-N,N-dimethyltryptamine formulation (GH001) in healthy volunteers

Reckweg, J., Mason, N. L., van Leeuwen, C. et al. · Frontiers in Pharmacology (2021)

Examining Psychedelic-Induced Changes in Social Functioning and Connectedness in a Naturalistic Online Sample Using the Five-Factor Model of Personality

Nygart, V., Pommerencke, L. M., Carhart-Harris, R. L. et al. · Frontiers in Psychology (2021)

Acute effects of psilocybin after escitalopram or placebo pretreatment in a randomized, double-blind, placebo-controlled, cross-over study in healthy subjects

Becker, A. M., Holze, F., Grandinett, T. et al. · Clinical Pharmacology and Therapeutics (2021)

Psychedelic experience dose-dependently modulated by cannabis: results of a prospective online survey

Kuc, J., Kettner, H., Rosas, F. E. et al. · Psychopharmacology (2021)

A narrative synthesis of research with 5-MeO-DMT

Ermakova, A. O., Dunbar, F., Rucker, J. et al. · Journal of Psychopharmacology (2021)

Psilocybin-induced changes in brain network integrity and segregation correlate with plasma psilocin level and psychedelic experience

Madsen, M. K., Stenbaek, D. S., Arvidsson, A. et al. · European Neuropsychopharmacology (2021)

Spiritual experiences in psychedelic-assisted psychotherapy: Case reports of communion with the divine, the departed, and saints in research using psilocybin for the treatment of alcohol dependence

Podrebarac, S. K., O'donnell, K. C., Mennenga, S. E. et al. · Spirituality in Clinical Practice (2021)

This Is Something That Changed My Life: A Qualitative Study of Patients' Experiences in a Clinical Trial of Ketamine Treatment for Alcohol Use Disorders

Mollaahmetoglu, O. M., Keeler, J., Ashbullby, K. J. et al. · Frontiers in Psychiatry (2021)

Increases in Psychological Flexibility Mediate Relationship Between Acute Psychedelic Effects and Decreases in Racial Trauma Symptoms Among People of Color

Davis, A. K., Xin, Y., Sepeda, N. D. et al. · Chronic Stress (2021)

Turn on, Tune in, and Drop out: Predictors of Attrition in a Prospective Observational Cohort Study on Psychedelic Use

Hübner, S., Haijen, E. C. H. M., Kaelen, M. et al. · Journal of Medical Internet Research (2021)

Trips and Neurotransmitters: Discovering Principled Patterns across 6,850 Hallucinogenic Experiences

Ballentine, G., Friedman, S. F., Bzdok, D. · Science Advances (2021)

44 cited
Psychedelics alter metaphysical beliefs

Timmermann, C., Kettner, H., Letheby, C. et al. · Scientific Reports (2021)

Reconciling Mystical Experiences with Naturalistic Psychedelic Science: Reply to Sanders and Zijlmans

Jylkkä, J. · ACS Pharmacology and Translational Science (2021)

Future Directions for Clinical Psilocybin Research: The Relaxed Symptom Network

Lewis-Healey, E., Laukkonen, R., Van Elk, M. · Psyarxiv (2021)

1 cited
Protocol for Outcome Evaluation of Ayahuasca-Assisted Addiction Treatment: The Case of Takiwasi Center

Rush, B., Marcus, O., García, S. et al. · Frontiers in Pharmacology (2021)

19 cited
Psychedelics and Consciousness: Distinctions, Demarcations, and Opportunities

Yaden, D. B., Johnson, M. W., Griffiths, R. R. et al. · International Journal of Neuropsychopharmacology (2021)

The epidemiology of mescaline use: Pattern of use, motivations for consumption, and perceived consequences, benefits, and acute and enduring subjective effects

Uthaug, M. V., Davis, A. K., Davis, D. et al. · Journal of Psychopharmacology (2021)

49 cited
A qualitative and quantitative account of patient’s experiences of ketamine and its antidepressant properties

Sumner, R. L., Chacko, E., Mcmillan, R. et al. · Journal of Psychopharmacology (2021)

51 cited
Psychedelic Communitas: Intersubjective experience during psychedelic group sessions predicts enduring changes in psychological wellbeing and social connectedness

Kettner, H., Rosas, F. E., Timmermann, C. et al. · Frontiers in Pharmacology (2021)

157 cited
Examining changes in personality following shamanic ceremonial use of ayahuasca

Weiss, B., Miller, J. D., Carter, N. T. et al. · Scientific Reports (2021)

53 cited
Naturalistic Use of Mescaline Is Associated with Self-Reported Psychiatric Improvements and Enduring Positive Life Changes

Agin-Liebes, G. I., Lancelotta, R., Uthaug, M. V. et al. · ACS Pharmacology and Translational Science (2021)

Combining Psychedelic and Mindfulness Interventions: Synergies to Inform Clinical Practice

Payne, J. E., Chambers, R., Liknaitzky, P. · ACS Pharmacology and Translational Science (2021)

55 cited
Psychedelic Harm Reduction and Integration: A Transtheoretical Model for Clinical Practice

Palhano-Fontes, F., Gorman, I., Nielson, E. M. et al. · Frontiers in Psychology (2021)

Baseline power of theta oscillations predicts mystical-type experiences induced by DMT in a natural setting

Tagliazucchi, E., Zamberlan, F., Cavanna, F. et al. · Frontiers in Psychiatry (2021)

Psychedelic Experiences and Mindfulness are Associated with Improved Wellbeing

Qiu, T. T., Minda, J. P. · Psyarxiv (2021)

Dose-response relationships of psilocybin-induced subjective experiences in humans

Hirschfeld, T., Schmidt, T. T. · Journal of Psychopharmacology (2021)

Optimal dosing for psilocybin pharmacotherapy: Considering weight-adjusted and fixed dosing approaches

Garcia-Romeu, A., Barrett, F. S., Carbonaro, T. M. et al. · Journal of Psychopharmacology (2021)

Neural and subjective effects of inhaled N,N-dimethyltryptamine in natural settings

Pallavicini, C., Cavanna, F., Zamberlan, F. et al. · Journal of Psychopharmacology (2021)

Lasting effects of a single psilocybin dose on resting-state functional connectivity in healthy individuals

McCulloch, D. E-W., Madsen, M. K., Stenbæk, D. S. et al. · Journal of Psychopharmacology (2021)

Development of the Psychological Insight Questionnaire among a sample of people who have consumed psilocybin or LSD

Davis, A. K., Streeter Barrett, F., Griffiths, R. R. et al. · Journal of Psychopharmacology (2021)

108 cited
Set and Setting: A Randomized Study of Different Musical Genres in Supporting Psychedelic Therapy

Strickland, J. C., Garcia-Romeu, A., Johnson, M. W. · ACS Pharmacology and Translational Science (2020)

The Subjective Effects of Psychedelics Are Necessary for Their Enduring Therapeutic Effects

Yaden, D. B., Griffiths, R. R. · ACS Pharmacology and Translational Science (2020)

People of color in North America report improvements in racial trauma and mental health symptoms following psychedelic experiences

Williams, T. M., Davis, A. K., Xin, Y. et al. · Drugs Education Prevention and Policy (2020)

Acute and subacute psychoactive effects of Kambô, the secretion of the Amazonian Giant Maki Frog (Phyllomedusa bicolor): retrospective reports

Schmidt, T. T., Reiche, S., Hage, L. T. et al. · Scientific Reports (2020)

9 cited
Psilocybin-Assisted Group Therapy and Attachment: Observed Reduction in Attachment Anxiety and Influences of Attachment Insecurity on the Psilocybin Experience

Stauffer, C., Anderson, B. T., Ortigo, K. M. et al. · ACS Pharmacology and Translational Science (2020)

51 cited
Psychedelics and Psychotherapy

Nayak, S., Johnson, M. W. · Pharmacopsychiatry (2020)

Acute dose-dependent effects of lysergic acid diethylamide in a double-blind placebo-controlled study in healthy subjects

Holze, F., Vizeli, P., Ley, L. et al. · Neuropsychopharmacology (2020)

192 cited
Acute subjective effects in LSD- and MDMA-assisted psychotherapy

Schmid, Y., Gasser, P., Oehen, P. et al. · Journal of Psychopharmacology (2020)

72 cited
Brain serotonin 2A receptor binding predicts subjective temporal and mystical effects of psilocybin in healthy humans

Stenbæk, D. S., Madsen, M. K., Ozenne, B. et al. · Journal of Psychopharmacology (2020)

Classic Psychedelics as a Psychotherapeutic Aid in the Treatment of Stimulant Use Disorder: a Case Report

Johnson, S., Black, Q. C. · International Journal of Mental Health and Addiction (2020)

1 cited
Psilocybin acutely alters the functional connectivity of the claustrum with brain networks that support perception, memory, and attention

Barrett, F. S., Krimmel, S. R., Griffiths, R. R. et al. · NeuroImage (2020)

Mystical Experiences in Retrospective Reports of First Times Using a Psychedelic in Finland

Kangaslampi, S., Hausen, A., Rauteenmaa, T. · Journal of Psychoactive Drugs (2020)

Subjective features of the psilocybin experience that may account for its self-administration by humans: a double-blind comparison of psilocybin and dextromethorphan

Carbonaro, T. M., Johnson, M. W., Griffiths, R. R. · Psychopharmacology (2020)

A potential role for psilocybin in the treatment of obsessive-compulsive disorder

Jacobs, E. · Journal of Psychedelic Studies (2020)

Integrating psychotherapy and psychopharmacology: psychedelic-assisted psychotherapy and other combined treatments

Greenway, K. T., Garel, N., Jerome, L. et al. · Expert Review of Clinical Pharmacology (2020)

Broadening Your Mind to Include Others: The relationship between serotonergic psychedelic experiences and maladaptive narcissism

Van Mulukom, V., Patterson, R. E., Van Elk, M. · Psychopharmacology (2020)

Isness: Using Multi-Person VR to Design Peak Mystical Type Experiences Comparable to Psychedelics

Glowacki, D. R., Wonnacott, M. D., Freire, R. et al. · Association for Computing Machinery (2020)

32 cited
A single psilocybin dose is associated with long-term increased mindfulness, preceded by a proportional change in neocortical 5-HT2A receptor binding

Madsen, M. K., Fisher, P. M., Stenbæk, D. S. et al. · European Neuropsychopharmacology (2020)

Tripping on nothing: placebo psychedelics and contextual factors

Olson, J. A., Suissa-Rocheleau, L., Lifshitz, M. et al. · Psychopharmacology (2020)

Psychedelics and Psychedelic-Assisted Psychotherapy

Reiff, C. M., Richman, E. E., Nemeroff, C. B. et al. · American Journal of Psychiatry (2020)

Acute effects of psilocybin on glutamate concentration levels, functional connectivity and subjective state

Mason, N. L., Feilding, A., Ramaekers, J. G. · European Neuropsychopharmacology (2020)

Persisting Reductions in Cannabis, Opioid, and Stimulant Misuse After Naturalistic Psychedelic Use: An Online Survey

Garcia-Romeu, A., Davis, A. K., Griffiths, R. R. et al. · Frontiers in Psychiatry (2020)

121 cited
Therapeutic Use of LSD in Psychiatry: A Systematic Review of Randomized-Controlled Clinical Trials

Fuentes, J. J., Fonseca, F., Elices, M. et al. · Frontiers in Psychiatry (2020)

Psychological flexibility mediates the relations between acute psychedelic effects and subjective decreases in depression and anxiety

Davis, A. K., Barrett, F. S., Griffiths, R. R. · Journal of Contextual Behavioral Science (2020)

Embedding existential psychology within psychedelic science: reduced death anxiety as a mediator of the therapeutic effects of psychedelics.

Moreton, S. G., Szalla, L., Menzies, R. E. et al. · Psychopharmacology (2019)

47 cited
Distinct acute effects of LSD, MDMA, and D-amphetamine in healthy subjects.

Holze, F., Vizeli, P., Müller, F. et al. · Neuropsychopharmacology (2019)

214 cited
Replication and extension of a model predicting response to psilocybin

Russ, S. L., Carhart-Harris, R. L., Maruyama, G. et al. · Psychopharmacology (2019)

55 cited
Cessation and reduction in alcohol consumption and misuse after psychedelic use

Garcia-Romeu, A., Davis, A. K., Fire Erowid et al. · Journal of Psychopharmacology (2019)

211 cited
Survey of subjective “God encounter experiences”: Comparisons among naturally occurring experiences and those occasioned by the classic psychedelics psilocybin, LSD, ayahuasca, or DMT

Griffiths, R. R., Hurwitz, E. S., Davis, A. K. et al. · PLOS ONE (2019)

171 cited
5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT) used in a naturalistic group setting is associated with unintended improvements in depression and anxiety

Davis, A. K., So, S., Lancelotta, R. et al. · The American Journal of Drug and Alcohol Abuse (2019)

113 cited
States and traits related to the quality and consequences of psychedelic experiences

Russ, S. L., Carhart-Harris, R. L., Maruyama, G. et al. · Psychology of Consciousness Theory Research and Practice (2019)

Psychedelic effects of psilocybin correlate with serotonin 2A receptor occupancy and plasma psilocin levels

Madsen, M. K., Fisher, P. M., Burmester, D. et al. · Neuropsychopharmacology (2019)

Intensity of Mystical Experiences Occasioned by 5-MeO-DMT and Comparison With a Prior Psilocybin Study

Barsuglia, J. P., Davis, A. K., Palmer, R. et al. · Frontiers in Psychology (2018)

Current perspectives on psychedelic therapy: use of serotonergic hallucinogens in clinical interventions

Richards, W. A., Garcia-Romeu, A. · International Review of Psychiatry (2018)

Predicting responses to psychedelics: a prospective study

Haijen, E. C. H. M., Kaelen, M., Roseman, L. et al. · Frontiers in Pharmacology (2018)

339 cited
Awe: a putative mechanism underlying the effects of classic psychedelic-assisted psychotherapy

Hendricks, P. S. · International Review of Psychiatry (2018)

143 cited
DMT models the near-death experience

Timmermann, C., Roseman, L., Williams, L. et al. · Frontiers in Psychology (2018)

Double-blind comparison of the two hallucinogens psilocybin and dextromethorphan: effects on cognition

Barrett, F. S., Carbonaro, T. M., Hurwitz, E. et al. · Psychopharmacology (2018)

78 cited
High dose psilocybin is associated with positive subjective effects in healthy volunteers

Nicholas, C. R., Henriquez, K. M., Gassman, M. C. et al. · Journal of Psychopharmacology (2018)

61 cited
Unifying theories of psychedelic drug effects

Swanson, L. R. · Frontiers in Pharmacology (2018)

The psychedelic debriefing in alcohol dependence treatment: illustrating key change phenomena through qualitative content analysis of clinical sessions

Kraehenmann, R., Nielson, E. M., May, D. G. et al. · Frontiers in Pharmacology (2018)

Clinical interpretations of patient experience in a trial of psilocybin-assisted psychotherapy for alcohol use disorder

Bogenschutz, M. P., Podrebarac, S. K., Duane, J. H. et al. · Frontiers in Pharmacology (2018)

Psilocybin-occasioned mystical-type experience in combination with meditation and other spiritual practices produces enduring positive changes in psychological functioning and in trait measures of prosocial attitudes and behaviors

Griffiths, R. R., Johnson, M. W., Richards, W. A. et al. · Journal of Psychopharmacology (2017)

393 cited
The Mechanisms of Psychedelic Visionary Experiences: Hypotheses from Evolutionary Psychology

Winkelman, M. J. · Frontiers in Neuroscience (2017)

Long-lasting subjective effects of LSD in normal subjects

Schmid, Y., Liechti, M. E. · Psychopharmacology (2017)

Psychedelics and connectedness

Carhart-Harris, R. L., Erritzoe, D., Haijen, E. C. H. M. et al. · Psychopharmacology (2017)

Qualitative and quantitative features of music reported to support peak mystical experiences during psychedelic therapy sessions

Slevc, L. R., Barrett, F. S., Robbins, H. et al. · Frontiers in Psychology (2017)

Psychedelics, personality and political perspectives

Nour, M. R., Evans, J., Carhart-Harris, R. L. · Journal of Psychoactive Drugs (2017)

164 cited
An online survey of tobacco smoking cessation associated with naturalistic psychedelic use

Johnson, M. W., Garcia-Romeu, A., Johnson, P. S. et al. · Journal of Psychopharmacology (2017)

117 cited
Psilocybin produces substantial and sustained decreases in depression and anxiety in patients with life-threatening cancer

Griffiths, R. R., Johnson, M. W. · Journal of Psychopharmacology (2016)

Rapid and sustained symptom reduction following psilocybin treatment for anxiety and depression in patients with life-threatening cancer: A randomized controlled trial

Ross, S., Bossis, A. P., Guss, J. et al. · Journal of Psychopharmacology (2016)

The Challenging Experience Questionnaire: Characterization of challenging experiences with psilocybin mushrooms

Barrett, F. S., Bradstreet, M. P., Leoutsakos, J. M. S. et al. · Journal of Psychopharmacology (2016)

Psychedelics as Medicines: An Emerging New Paradigm

Nichols, C. D., Nichols, D. E., Johnson, M. W. · Clinical Pharmacology and Therapeutics (2016)

Alterations of consciousness and mystical-type experiences after acute LSD in humans

Liechti, M. E., Dolder, P. C., Schmid, Y. · Psychopharmacology (2016)

190 cited
Survey study of challenging experiences after ingesting psilocybin mushrooms: Acute and enduring positive and negative consequences

Carbonaro, T. M., Bradstreet, M. P., Barrett, F. S. et al. · Journal of Psychopharmacology (2016)

Clinical Applications of Hallucinogens: A Review

Garcia-Romeu, A., Kersgaard, B., Addy, P. H. · Experimental and Clinical Psychopharmacology (2016)

174 cited
Measuring the subjective: revisiting the psychometric properties of three rating scales that assess the acute effects of hallucinogens

Bouso, J. C., Pedrero-Pérez, E. J., Gandy, S. · Human Psychopharmacology (2016)

42 cited
Treating Addiction: Perspectives from EEG and Imaging Studies on Psychedelics

Tófoli, L. F., De Araujo, D. B. · International Review of Neurobiology (2016)

Long-term follow-up of psilocybin-facilitated smoking cessation

Johnson, M. W., Garcia-Romeu, A., Griffiths, R. R. · The American Journal of Drug and Alcohol Abuse (2016)

562 cited
Ego-dissolution and psychedelics: validation of the ego-dissolution inventory (EDI)

Nour, M. R., Evans, J., Nutt, D. J. et al. · Frontiers in Human Neuroscience (2016)

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