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However, the systematic time-course of these changes from administration through the 24-hour sub-acute phase remains poorly characterized.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>\n                      In a double-blind, placebo-controlled, crossover trial (\n                      <jats:italic toggle=\"yes\">N<\/jats:italic>\n                      \u2009=\u200920, 10 females), healthy participants received a medium dose \u223c0.26\u2009mg\/kg of psilocybin. High-density resting-state electroencephalography and psychological states were assessed at baseline, 1, 3, 6, and 24\u2009hours, with a 28-day follow-up.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      Psilocybin acutely decreased alpha\/beta power and increased gamma-band signal diversity (1\u20133\u2009hours; returning to baseline at 6\u2009hours). Increased gamma diversity correlated with acute psychological effects (Brief Psychiatric Rating Scale,\n                      <jats:italic toggle=\"yes\">r<\/jats:italic>\n                      \u2009=\u20090.71), with the largest increases observed in participants with lower baseline complexity. At 24\u2009hours, reduced delta\/theta power correlated with Positive Life Changes (Persisting Effects Questionnaire) at 4\u2009weeks (\n                      <jats:italic toggle=\"yes\">r<\/jats:italic>\n                      \u2009=\u2009\u22120.47 to \u22120.57) but was independent of acute psychological intensity.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion:<\/jats:title>\n                    <jats:p>Our findings corroborate known acute effects while identifying a distinct sub-acute \u201cafterglow\u201d associated with long-term outcomes. The dissociation between acute psychology and 24-hour spectral shifts suggests that therapeutic benefits may be driven by sub-acute reductions in top-down cortical hierarchy. These results highlight the significance of the sub-acute window for psychological transformation and suggest normalized diversity as a viable baseline biomarker of individual responsiveness to psychedelic intervention.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/02698811261473445","type":"journal-article","created":{"date-parts":[[2026,9,5]],"date-time":"2026-09-05T05:47:16Z","timestamp":1788587236000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Psilocybin-induced changes in electroencephalography link acute and long-term effects"],"prefix":"10.1177","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2564-7287","authenticated-orcid":false,"given":"Marek","family":"Nikoli\u010d","sequence":"first","affiliation":[{"name":"Third Medical Faculty, Charles University, Praha, Czechia"},{"name":"Psychedelic Research Centre, National Institute of Mental Health, Klecany, Czechia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9899-5274","authenticated-orcid":false,"given":"Tom","family":"Froese","sequence":"additional","affiliation":[{"name":"Embodied Cognitive Science Unit, Okinawa Institute of Science and Technology, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1789-5894","authenticated-orcid":false,"given":"Pedro A. 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