Neuropharmacology
November 2, 2025
Luisa Prochazkova, Josephine Marschall, Michiel van Elk et al.
2 citations
BackgroundTaking very small doses of psychedelics (LSD, truffles) over an extended period became prevalent in Western societies for its alleged cognitive benefit, including enhanced creativity. However, in the absence of robust, double-blind-controlled quantitative studies, such claims remain anecdotal.MethodsHere we present results from 3 double-blind placebo-controlled longitudinal trials...
May 2, 2024
Jeremy I Skipper, George Fejer, Matthieu Koroma et al.
preprint
This interview explores the intimate relationship between language and consciousness, drawing insights from aphasia phenomenology, psychedelic experiences, and neuroscientific theories. Jeremy I. Skipper, a cognitive neuroscientist, argues that language is not merely a tool for reporting conscious experiences but plays a generative role in shaping and sustaining consciousness itself. He...
Current Psychology
September 8, 2023
Camile Bahi, Mona Irrmischer, Katrien Franken et al.
27 citations
Abstract Breathwork as a means of inducing non-ordinary states of consciousness is gaining traction as a potential therapeutic modality. We examined the effects of breathwork (in the form of connected breathing) on electroencephalography (EEG) and mood in 20 healthy participants (aged between 23 and 39 years (female = 11, M age = 29). In addition, to compare with other means of inducing...
Journal of Psychopharmacology
December 17, 2021
Josephine Marschall, George Fejer, Pascal Lempe et al.
69 citations
Background: Microdoses of psychedelics (i.e. a sub-hallucinogenic dose taken every third day) can reduce symptoms of depression, anxiety and stress according to anecdotal reports and observational studies. Research with medium to high doses of psilocybin points towards potential underlying mechanisms, including the modulation of emotion and interoceptive processing. Aims: In this preregistered...
June 14, 2021
Luisa Prochazkova, Michiel van Elk, Josephine Marschall et al.
4 citations
preprint
Introduction: Microdosing refers to the repetitive administration of tiny doses of psychedelics (LSD, Psilocybin) over an extended period of time. This practice has been linked to alleged cognitive benefits, such as improved mood and creativity, potentiated by targeting serotonergic 5-HT2A receptors and facilitating cognitive flexibility. Nonetheless, in the absence of robust, quantitative and...
Psychopharmacology
April 30, 2021
Michiel van Elk, George Fejer, Pascal Lempe et al.
53 citations
Abstract There is an increased societal trend to engage in microdosing, in which small sub-hallucinogenic amounts of psychedelics are consumed on a regular basis. Following subjective reports that microdosing enhances the experience of nature and art, in the present study we set out to study the effects of psilocybin microdosing on feelings of awe and art perception. In this preregistered...
George Fejer, Manoj K. Doss
preprint
In this interview, Manoj Doss addresses the "Cinco Sins of Psychedelic Research," highlighting methodological concerns and biases, including those stemming from self-experimentation and researchers' personal drug experiences. Advocating for a closer integration of cognitive psychology and neuropharmacology, he calls for empirical approaches to study psychedelics' effects on cognition and...
George Fejer, Till Holzapfel, Taru Hirvonen et al.
preprint
Abstract Breath-based interactions in virtual reality typically map breathing onto discrete visual objects or physiological proxies. Viscereality instead translates respiratory state into a surrounding particle field, mapping lung volume onto external space so that inhalation expands the environment and exhalation contracts it. Because particle fields have no fixed boundary, they can convey...