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The psychometric potential of the non-MEQ items of the PES remains largely unexplored.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Aims:<\/jats:title>\n                    <jats:p>We investigated whether the PES also yields subscales besides the MEQ30 subscales.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>Data from 239 PES measurements (140 healthy participants) from six studies with moderate to high doses of lysergic acid diethylamide and\/or psilocybin were included. New subscales (with items other than MEQ30) were created and validated as follows: (1) theoretical derivation of candidate items; (2) removal of items with rare experiences; (3) exploratory factor analysis; and (4) confirmatory factor analysis. Correlations of subscales within the PES and between the PES and the 5-Dimensional Altered States of Consciousness Scale (5D-ASC) were performed. In addition, a cluster analysis using all items (except rare experiences) was performed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>The reliability of the four original factors of the MEQ30 was confirmed and four additional factors for the non-MEQ items were revealed: paradoxicality, connectedness, visual experience, and distressing experience. The first two additional factors were strongly correlated with the MEQ30 mystical subscale. Adding the new subscales to the MEQ30 subscales increased the explained variance with the 5D-ASC. The cluster analysis confirmed our main results and provided additional insights for future psychedelic psychometrics.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>The study yields a new validated 6-factor structure for extended mystical experience (MEQ40: MEQ30 + Paradoxicality + Connectedness) and covers psychedelic experience as a whole more comprehensively than has hitherto been possible within a single questionnaire (PES48). The entire PES (PES100) can also be used for further future psychedelic-psychometric research.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/02698811231199112","type":"journal-article","created":{"date-parts":[[2023,10,31]],"date-time":"2023-10-31T04:17:12Z","timestamp":1698725832000},"page":"80-100","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":27,"title":["The revival of the psychedelic experience scale: Revealing its extended-mystical, visual, and distressing experiential spectrum with LSD and psilocybin studies"],"prefix":"10.1177","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6161-7114","authenticated-orcid":false,"given":"Kurt","family":"Stocker","sequence":"first","affiliation":[{"name":"Psychopharmacology Research, Division of Clinical Pharmacology &amp; Toxicology, Department of Clinical Research, University Hospital Basel, and University of Basel, Basel, Switzerland"},{"name":"Chair of Cognitive Science, Department of Humanities, Social and Political Sciences, ETH Swiss Federal Institute of Technology Zurich, Zurich, Switzerland"},{"name":"Department of Psychology, University of Zurich, Zurich, Switzerland"},{"name":"Faculty of Psychology, UniDistance Suisse, Brig, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthias","family":"Hartmann","sequence":"additional","affiliation":[{"name":"Faculty of Psychology, UniDistance Suisse, Brig, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Ley","sequence":"additional","affiliation":[{"name":"Psychopharmacology Research, Division of Clinical Pharmacology &amp; Toxicology, Department of Clinical Research, University Hospital Basel, and University of Basel, Basel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anna M","family":"Becker","sequence":"additional","affiliation":[{"name":"Psychopharmacology Research, Division of Clinical Pharmacology &amp; Toxicology, Department of Clinical Research, University Hospital Basel, and University of Basel, Basel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Friederike","family":"Holze","sequence":"additional","affiliation":[{"name":"Psychopharmacology Research, Division of Clinical Pharmacology &amp; Toxicology, Department of Clinical Research, University Hospital Basel, and University of Basel, Basel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1765-9659","authenticated-orcid":false,"given":"Matthias E","family":"Liechti","sequence":"additional","affiliation":[{"name":"Psychopharmacology Research, Division of Clinical Pharmacology &amp; Toxicology, Department of Clinical Research, University Hospital Basel, and University of Basel, Basel, Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2023,10,31]]},"reference":[{"key":"e_1_3_4_2_1","doi-asserted-by":"publisher","DOI":"10.7717\/peerj.3149."},{"key":"e_1_3_4_3_1","doi-asserted-by":"publisher","DOI":"10.1177\/0269881116678781"},{"key":"e_1_3_4_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/7854_2017_474."},{"key":"e_1_3_4_5_1","doi-asserted-by":"publisher","DOI":"10.1177\/0269881115609019."},{"key":"e_1_3_4_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/cpt.2487."},{"key":"e_1_3_4_7_1","doi-asserted-by":"publisher","DOI":"10.1093\/ijnp\/pyac075."},{"key":"e_1_3_4_8_1","volume-title":"Psychology: Foundations and Frontiers","author":"Bernstein DA","year":"2016","unstructured":"Bernstein DA (2016) Psychology: Foundations and Frontiers. 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