Derived results and figures for: An Observational Study on the Effects of Psilocybin Truffle Use in a Retreat Setting
Hüseyin Beyköylü, Merijn Mestdagh, Fred Hasselman, Hein T. van Schie, Michiel van Elk
Psychology Archives September 30, 2026 DOI: 10.23668/psycharchives.22553 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Observational study Peer reviewed |
|---|---|
| Sample size | 14 |
| Population | Adults attending legal psilocybin truffle retreats in the Netherlands |
| Topics | Psilocybin |
| Key findings | The record provides derived analyses from an observational study of fourteen adults at legal psilocybin truffle retreats, including per-participant time series, dynamic complexity measures, collective variable validation, timing of destabilization, and sensitivity analyses. No specific outcomes or conclusions are reported in the abstract. |
Abstract
Derived results from an observational study of fourteen adults attending legal psilocybin truffle retreats in the Netherlands. Includes the per-participant time series of the collective variable, dynamic complexity and detected levels; the per-participant summary table; item diagnostics and collective variable validation; the timing of destabilization; two sensitivity analyses; the full analysis report; and the figures. Produced by the accompanying analysis code record from the accompanying research data record.
Comparable studies
Other observational and cohort studies on psilocybin, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| Psilocybin for treatment-resistant depression: fMRI-measured brain mechanisms. Patients with treatment-resistant depression | 2017 | Observational cohort | n = 19 |
| Psychedelic effects of psilocybin correlate with serotonin 2A receptor occupancy and plasma psilocin levels Healthy volunteers | 2019 | Observational cohort | n = 8 |
| Increased spontaneous MEG signal diversity for psychoactive doses of ketamine, LSD and psilocybin Humans | 2017 | Observational study | |
| Classic psychedelic use is associated with reduced psychological distress and suicidality in the United States adult population. USA adult respondents from the National Survey on Drug Use and Health (2008-2012) | 2015 | Observational cohort | n = 190,000 |
| Prediction of Psilocybin Response in Healthy Volunteers Healthy volunteers | 2012 | Observational cohort | n = 409 |