Table 1.
Questionnaires and their factor/scale-structure from which data is included.
| Questionnaire | Versions | Scales/Factors | Original publication | Psychometric properties |
|---|---|---|---|---|
| Altered States of Consciousness Rating Scale | APZ | (1) Oceanic Boundlessness, (2) Dread of Ego Dissolution, (3) Visionary Restructuralization | Dittrich, 1975, 1985 | Dittrich, 1985 |
| 5D-ASC | (1) Oceanic Boundlessness, (2) Dread of Ego Dissolution, (3) Visionary Restructuralization, (4) Auditory Alterations, (5) Vigilance Reduction | Bodmer et al., 1994; Dittrich et al., 2006 | Dittrich et al., 2010 | |
| 11D-ASC | (1) Experience of Unity, (2) Spiritual Experience, (3) Blissful State, (4) Insightfulness, (5) Disembodiment, (6) Impaired Control and Cognition, (7) Anxiety, (8) Complex Imagery, (9) Elementary Imagery, (10) Audio-Visual Synesthesia, (11) Changed Meaning of Percepts | Studerus et al., 2010 | Studerus et al., 2010 | |
| Phenomenology of Consciousness Inventory | PCI | (1) Positive Affect, (a.) Joy, (b.) Sexual Excitement, (c.) Love, (2) Negative Affect (a.) Anger, (b.) Sadness, (c.) Fear, (3) Altered Experience, (a.) Altered Body Image, (b.) Altered Time Sense, (c.) Altered Perception, (d.) Altered Meaning, (4) Visual Imagery, (a.) Amount, (b.) Vividness, (5) Attention, (a.) Direction, (b.) Absorption, (6) Self Awareness, (7) Altered State of Awareness, (8) Internal Dialogue, (9) Rationality, (10) Volitional Control, (11) Memory, (12) Arousal | Pekala, 1991 | Pekala, 1991, 1995; German version: Rux, 2002 |
| Hallucinogen Rating Scale | HRS | (1) Somaesthesia (2) Affect (3) Perception (4) Cognition (5) Volition (6) Intensity | Strassman et al., 1994 | Strassman et al., 1994; Riba et al., 2001; Bouso et al., 2016 |
| Mystical Experience Questionnaire | MEQ30 | (1) Mystical, (2) Positive Mood (3) Transcendence of time and space (4) Ineffability | Pahnke, 1963, 1966; MacLean et al., 2012 | MacLean et al., 2012; Barrett et al., 2015; Spanish version:Bouso et al., 2016; Portugese version: Schenberg et al., 2017 |
Each questionnaire has a specific structure of factors/scales (and subscales in the case of the PCI), for which research articles typically report group summary data, i.e., mean ± variability. Data on the questionnaires psychometric properties, as well as validation and reliability measures can be obtained from the provided references. The literature research to identify relevant research data was primarily based on forward-citations of the questionnaires original reports and reports on methodological refinements and translations.