Peak Experiences of Psilocybin Users and Non-Users

Peak experiences are described as exceptionally meaningful moments characterised by awe, well-being, transcendence and a loss of ordinary temporal or spatial orientation. Cummins and Lyke situate these events within the history of humanistic and positive psychology and note renewed empirical interest in psychoactive substances such as psilocybin, which in controlled studies has produced experiences subjectively rated as highly meaningful and sometimes akin to mystical states. The authors summarise prior laboratory work indicating persistent positive changes after psilocybin and mention proposed neuropharmacological mechanisms (notably 5-HT2A receptor activity), while emphasising that recreational (naturalistic) use takes place in varied set and setting, which may alter outcomes compared with laboratory conditions. This study set out to compare peak experiences reported by three groups: psilocybin users who reported their peak experience occurred while under the influence of psilocybin (psilocybin peak experience: PPE), psilocybin users whose peak experience did not occur while on psilocybin (non-psilocybin peak experience: NPPE), and participants who had never used psilocybin (non-user: NU). Two primary goals were defined: to estimate what proportion of psilocybin users recalled their peak experience as occurring during psilocybin use, and to test whether the groups differed in the degree and character of altered consciousness during their reported peak. The authors hypothesised that a majority of psilocybin users would report a psilocybin-related peak and that psilocybin users would report greater alteration of consciousness than non-users. The research therefore aims to extend experimental findings into naturalistic contexts and to characterise whether recreational psilocybin experiences differ from other kinds of peak experiences reported by users and non-users.

Participants were recruited by convenience and snowball sampling from undergraduate classes at a small public college in the US Northeast and from attendees at a four-day music festival frequented by psilocybin users. Recruitment materials included flyers with an option to supply an e-mail address to receive an online questionnaire. A total of 101 people completed the survey. Data collection used a two-part online questionnaire. The demographic section asked age, gender, religion and race, plus four items about psilocybin use (ever used, current frequency, lifetime number of uses, approximate date of last use). Participants were instructed to recall a "peak experience" (defined as the best experience or group of experiences of their life, with examples such as significant life events, flow states, religious/mystical experiences, paranormal events or drug-related experiences) and to complete the Aussergewohnliche Psychische Zustande (APZ) instrument with reference to how they recalled feeling during that peak. The APZ is a 72-item yes/no measure of altered states of consciousness yielding four scales: oceanic boundlessness (OB, positive mystical-type experiences), dread of ego dissolution (DED, negative/dysphoric experiences), visionary restructuralization (VR, perceptual and hallucinatory phenomena) and an overall alteration of consciousness score (ASC). After the APZ participants indicated whether the described peak occurred during a psilocybin-induced state and whether other drugs were present. Analyses compared the three groups (PPE, NPPE, NU). The investigators report conducting tests for demographic differences (t-test for age, chi-square for gender) and used multivariate analysis of variance (MANOVA) to compare APZ scales across groups, with post-hoc pairwise comparisons using LSD tests. Four participants who reported their peak occurred during psilocybin but also reported use of other drugs at the time were excluded from further analyses; the extracted text does not make entirely clear the final group sizes after these exclusions.

Sample characteristics: Of the 101 participants, 71% were female and 29% male. Ages ranged from 18 to 55 (mean = 24.47, SD = 5.82). The sample was 82% Caucasian, 7% African American, 6% Hispanic, 3% Asian and 2% Other. Religious background was 66% Christian, 1% Jewish, 1% Muslim, 23% None and 9% Other. Sixty-six percent of the sample reported they had never used psilocybin, while 34% reported lifetime psilocybin use. Among those reporting prior psilocybin use, the extracted text states that 16 participants (47%) reported their peak experience occurred while under psilocybin and 18 participants (reported as 63% in the extraction) reported it did not; these percentage figures are internally inconsistent in the extracted text. Four participants who indicated a psilocybin-related peak also reported other drug use at the time and were removed from further analyses. Psilocybin users did not differ significantly from non-users in age (t(95) = -0.78, p > .05), but there were significantly more male psilocybin users than non-users (χ2(1) = 8.43, p < .01). The authors noted that analyses matched on gender did not differ meaningfully from analyses of the full sample. Primary outcomes: A MANOVA comparing the three groups on the APZ scales (OB, DED, VR, ASC) produced significant group differences. Post-hoc LSD tests showed that both PPE and NPPE groups reported significantly greater oceanic boundlessness than the NU group, with no significant difference between PPE and NPPE. For dread of ego dissolution, the PPE group reported significantly higher levels than either NPPE or NU, which did not differ from each other. Visionary restructuralization differed across all three groups in a graded pattern: PPE scored highest, NPPE intermediate, and NU lowest, with each pairwise difference significant. For the overall alteration of consciousness (ASC) total score, the PPE group reported significantly greater total alteration than the NPPE and NU groups, which did not differ significantly from each other. The extracted text indicates figures presented estimated marginal means for each dependent variable and group, but numerical effect sizes, confidence intervals and exact p-values for the MANOVA omnibus test are not provided in the available extraction.

Cummins and Lyke interpret their findings as evidence that a substantial portion of recreational psilocybin users recall peak experiences occurring during psilocybin use and that peak experiences of psilocybin users differ in measurable ways from those of non-users. The authors state that, as predicted, a majority of psilocybin users reported a psilocybin-related peak; however, the extracted data show 16 users reporting a psilocybin-related peak (raw count) and also report percentages that appear inconsistent, a discrepancy the extracted text does not resolve. The investigators compare their naturalistic findings with prior laboratory research (for example Griffiths et al.), noting that the proportion reporting psilocybin-related peak experiences here (reported as 47% in the extraction) was lower than the incidence of full mystical experiences found in some experimental studies (reported comparisons include 61% or 67% in different prior reports), and they suggest differences in participant selection (for example prior spiritual practice) and uncontrolled naturalistic contexts as possible explanations. In interpreting the APZ results, the authors highlight that both groups of psilocybin users (PPE and NPPE) reported greater oceanic boundlessness than non-users, which could reflect either pre-existing personality or value differences among people who use psilocybin or effects of drug use; the cross-sectional, retrospective design precludes causal inference. The PPE group’s higher dread of ego dissolution may reflect specific psilocybin effects linked to 5-HT2A receptor activity, yet even when peak experiences included fear of ego dissolution they were still often judged by participants to be among their most wonderful life events. Visionary restructuralization followed a graded pattern PPE>NPPE>NU, consistent with hallucinogenic properties of psilocybin, while total ASC was greatest in PPE, suggesting stronger overall alteration when the peak occurred during psilocybin use. The authors acknowledge several limitations: reliance on retrospective self-report which may involve inaccurate recall of the experience or of which substances were used; the convenience and snowball sampling strategy which limits representativeness; and incomplete control over contextual factors that might influence peak experiences. They call for replication and recommend longitudinal designs and richer qualitative methods (for example in-depth interviews with larger, more diverse samples) to clarify causality, the persistence of effects, and whether naturalistic psilocybin-related peaks share the qualitative features of experimentally induced mystical experiences. The investigators suggest that further work should also attempt to characterise the circumstances that make particular peak experiences highly valued by experiencers.