Studies open for participants are listed first. Each study page explains who can take part and how to sign up.
Open for participants
Psychedelic experiences are measured with a patchwork of questionnaires — the Mystical Experience Questionnaire, the Challenging Experience Questionnaire, the Ego Dissolution Inventory, the 11-Dimensional Altered States…
Open for participants
The aim of this online survey study is to evaluate the prevalence of self-experimentation with psychedelics among psychedelic researchers, clinicians and facilitators.
Open for participants
This study aims to confirm the factor structure of the Altered States of Consciousness scale and to develop a brief alternative based on this structure.
Open for participants
Psychedelic experiences are measured with a patchwork of questionnaires — the Mystical Experience Questionnaire, the Challenging Experience Questionnaire, the Ego Dissolution Inventory, the 11-Dimensional Altered States…
Open for participants
The aim of this online survey study is to evaluate the prevalence of self-experimentation with psychedelics among psychedelic researchers, clinicians and facilitators.
Open for participants
This study aims to confirm the factor structure of the Altered States of Consciousness scale and to develop a brief alternative based on this structure.
Not recruiting
The Open Psilocybin Study is a randomised, double-blind, placebo-controlled crossover trial investigating how psilocybin changes the brain, the body and self-perception in healthy volunteers.
Not recruiting
In collaboration with retreat centers Eremia , Psytide , and Rejuvyn, this study is exploring the dynamics of personal transformation induced by the naturalistic use of psilocybin-containing truffles in retreat settings.
Not recruiting
In this study we investigate the effects of low to moderate doses of psilocybin on perceptual processing in healthy volunteers. The aim of this project is to unravel the basic neurocognitive mechanisms underlying the…
Not recruiting
The aim of this study is to determine how an intravenous infusion of S-ketamine compared to a placebo affects implicit body perception and neural signals to self-related information.
Not recruiting
In collaboration with retreat centers Innerlijke Reis, Inward Bound and Set and Setting , our research team is conducting a study with the purpose of uncovering the underlying brain activity and connectivity changes…
Not recruiting
This study used self-report quantitative and open-ended survey questions as well as a semi-structured interview to investigate the experiences of 12 religious leaders at a psilocybin retreat.
Not recruiting
This study aims to develop a new scale to assess changes in narrative and embodied self related to altered states of consciousness such as those induced by psychedelics and meditation.
Not recruiting
The Psychological Insight Scale (Peill et al., 2022) and the Emotional Breakthrough Inventory (Roseman et al., 2019) are psychometric scales that are commonly used in research investigating the effect of psychedelic…
Not recruiting
Our research group has performed focus groups with youth with a history of psychiatric care, parents, and clinicians to assess their views on MDMA-assisted therapy for youth with PTSD.
Not recruiting
In this survey study, we investigate how people describe and understand their psychedelic experiences and try to assess to what extent instruments capture these.
Not recruiting
This study that aims to investigate the modulation of self-other processing in the psychedelic state. This will be achieved by recording the responses of participants while they perform an online cognitive task two…
Not recruiting
We are recruiting people who are planning to attend a psychedelic ceremony and are interested in completing our surveys before and after their experience.