The Standardized Psychometric Assessment of Altered States of Consciousness (ASCs) in Humans
Pharmacopsychiatry July 1, 1998 DOI: 10.1055/s-2007-979351 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Experimental and field study Peer reviewed |
|---|---|
| Sample size | 1,133 |
| Population | Healthy subjects in six countries |
| Topics | Altered states of consciousness |
| Citations | 597 |
| Key findings | Altered states of consciousness share three oblique dimensions—Oceanic Boundlessness, Dread of Ego Dissolution, and Visionary Restructuralization—regardless of induction method. |
Abstract
The APZ questionnaire was developed in order to explore hypotheses on ASCs. First -- in a series of 11 experiments using different induction methods on N = 393 healthy subjects -- the hypothesis was tested that ASCs have major dimensions in common irrespective of the mode of their induction. In the International Study on Altered States of Consciousness (ISASC) the external validity of the experimental results was assessed. The ISASC was carried out on a total of N = 1133 subjects in six countries. The main results of the experimental studies were corroborated in the field studies. The results can be summarized as follows: the common denominator of ASCs is described by three oblique dimensions, designated as "Oceanic Boundlessness (OSE)", "Dread of Ego Dissolution (AIA)" and "Visionary Restructuralization (VUS)". The reliability and validity of the scales are satisfactory. Tested versions of the APZ scales are available in English (UK, USA), German, Italian and Portuguese. Psychometrically as yet untested versions exist in Dutch, Finnish, French, Greek, Spanish and Russian. The APZ questionnaire has become the international standard for the assessment of ASCs, thus helping to integrate research. A psychometrically improved version exists in German (OAV questionnaire). The BETA questionnaire, which measures the dimensions "Vigilance Reduction (VIR)" and "Auditive Alteration (AVE)" is also available in German. These dimensions are most likely etiology-dependent.
In the evidence
This study is part of the evidence base for a synthesis in the library. Here is how each one recorded it.
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Across induction methods, altered states shared three oblique dimensions (Oceanic Boundlessness, Dread of Ego Dissolution, Visionary Restructuralization), corroborated in field studies.
Synthesized
Comparable studies
Other experimental studies on altered states of consciousness, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| TMS-EEG and resting-state EEG applied to altered states of consciousness: oscillations, complexity, and phenomenology. | 2023 | Experimental study | |
| A Test of the Psychedelic Model of Altered States of Consciousness | 1976 | Experimental study with comparison groups | |
| Neural Correlates of Non-ordinary States of Consciousness in Pranayama Practitioners: The Role of Slow Nasal Breathing Experienced meditators | 2022 | Within-subjects comparison | n = 12 |
| Increased spontaneous EEG signal diversity during stroboscopically-induced altered states of consciousness Healthy adults | 2019 | Experimental study | |
| Cannabis-induced altered states of consciousness are associated with specific dynamic brain connectivity states Healthy occasional cannabis users (smoking cannabis ≤2 per week) | 2019 | Repeated-measures, within-subjects design | n = 19 |
Citations in the library
Cited by 447
- Psilocybin produces substantial and sustained decreases in depression and anxiety in patients with life-threatening cancer: A randomized double-blind trial Journal of Psychopharmacology November 30, 2016
- Psilocybin can occasion mystical-type experiences having substantial and sustained personal meaning and spiritual significance Psychopharmacology July 7, 2006
- Psilocybin-assisted treatment for alcohol dependence: A proof-of-concept study Journal of Psychopharmacology January 13, 2015
- Psilocybin occasioned mystical-type experiences: immediate and persisting dose-related effects. Psychopharmacology December 1, 2011
- Mystical experiences occasioned by the hallucinogen psilocybin lead to increases in the personality domain of openness Journal of Psychopharmacology September 28, 2011
and 442 more in the library