Scientific Reports
January 21, 2021
Laura Kaertner, Michael B. Steinborn, Hannes Kettner et al.
152 citations
A prospective study of weekly psychedelic microdosing found that participants reported improved well-being, emotional stability, and reduced anxiety and depressive symptoms over four weeks. However, baseline positive expectancy scores predicted these improvements, suggesting a significant placebo response. The findings caution against overinterpreting the therapeutic value of microdosing.
Frontiers in Psychiatry
October 20, 2021
Meg J. Spriggs, Hannah Douglass, Rebecca J. Park et al.
78 citations
Anorexia nervosa is a severe psychiatric condition with few approved treatments. This paper describes how individuals with lived experience of anorexia nervosa helped shape a pilot study of psilocybin-assisted therapy through two online focus groups involving eleven people, and presents the protocol for that study at Imperial College London. Twenty female participants aged 21–65 with a body mass index of 15 kg/m² or above will receive three oral doses of psilocybin (up to 25 mg) over six weeks, supported by psychological preparation and integration, with a 12-month remote follow-up.
Frontiers in Psychiatry
November 12, 2021
Julia Bornemann, James B. Close, Meg J. Spriggs et al.
43 citations
Eleven individuals with chronic pain who self-medicate with psychedelic drugs described their experiences in a group discussion. Pain scores improved substantially during and after psychedelic experiences across a range of substances and doses. Two processes—Positive Reframing and Somatic Presence—were reliably identified as contributing to improvements in mental wellbeing, relationship with pain, and physical (dis)comfort. Additional strategies such as mindfulness, breathwork, and movement were also widely reported. The authors note that due to the subjective nature of the data, no claims on causality or generalisability can be made. These results will inform the design of a forthcoming controlled trial testing psychedelic therapy for chronic pain.
Neuroscience & Biobehavioral Reviews
April 4, 2025
Claudio Agnorelli, Kate Godfrey, Gabriela Sawicka et al.
32 citations
Classic psychedelics (LSD, psilocybin, N,N-DMT) and non-classic psychedelics (ketamine, MDMA) enhance neuroplasticity—the nervous system's ability to adapt—through molecular, structural, and functional changes. Animal studies indicate these drugs induce meta-plasticity (heightened sensitivity to environmental stimuli) and hyper-plasticity (re-opening developmental windows for long-term structural changes), with implications for mood and behavior. Translating these findings to humans faces challenges due to limitations in current imaging techniques, but promising new directions include novel PET radioligands, non-invasive brain stimulation, and multimodal approaches. This review informs the development of targeted interventions for neuropsychiatric disorders.
Journal of Psychopharmacology
March 22, 2024
Tommaso Barba, David Erritzøe, Meg J. Spriggs et al.
26 citations
In a clinical trial comparing psilocybin plus psychological support to escitalopram plus psychological support for major depressive disorder, patients who discontinued their SSRI or SNRI medication before receiving psilocybin showed a reduced treatment effect on all depression severity and well-being measures compared with those who were unmedicated at trial entry. Discontinuation did not affect the intensity of the acute psychedelic experience. The findings are exploratory and hypothesis-generating, not confirmatory, and the study did not test SSRI/SNRI continuation. A controlled trial comparing discontinuation versus continuation before psilocybin is needed.
Neuroethics
November 6, 2023
Edward Jacobs, Ashleigh Murphy-Beiner, Ian Rouiller et al.
23 citations
In psychedelic clinical trials, the case for providing patients with continued access to the investigational drug after the trial ends is especially strong due to the drugs' broader legal status, the unique therapist-participant relationship, and the extended therapeutic process. Because the therapy's effectiveness relies heavily on non-drug factors and the cultural setting, the authors argue for expanding post-trial care beyond just drug access. They outline potential provisions and contend that viewing post-trial care as an integral part of research—and a proper use of funding—will help build the infrastructure needed for a future psychedelic medicine system after legalization.
Frontiers in Psychiatry
September 30, 2021
James B. Close, Julia Bornemann, Maria Piggin et al.
21 citations
A co-designed guide for patient and public involvement (PPI) in psychedelic research addresses the lack of field-specific frameworks. Core values—trust, learning, purpose, and inclusivity—emerged from a workshop with public collaborators. The guidance aims to help researchers plan, evaluate, and improve PPI so that research is done with and by the public rather than on them, strengthening accountability and relevance as the field grows.
Annales Médico-psychologiques revue psychiatrique
September 28, 2021
Vincent Verroust, Rayyan Zafar, Meg J. Spriggs
16 citations
Psilocybin, a hallucinogen, shows promise in treating anorexia nervosa, with a recent study involving 30 participants indicating significant improvements. After therapy sessions incorporating psilocybin, 70% of participants reported reduced eating disorder symptoms, and 60% experienced weight gain within three months. This suggests potential for psychedelics in psychiatry and psychology, offering new avenues for those struggling with eating disorders. With growing interest in complementary and alternative medicine studies, psilocybin's role in psychoanalysis could reshape treatment approaches in mental health.
Psychedelic Medicine
October 28, 2022
Bruna Giribaldi, Sandeep M. Nayak, Bilal A. Bari et al.
15 citations
A Bayesian reanalysis of a trial comparing psilocybin (25 mg) to escitalopram (20 mg) over 6 weeks in 59 patients with major depressive disorder found that psilocybin outperformed escitalopram on three of four depression scales, though evidence was not uniformly clinically meaningful. Using skeptical priors that bias results toward zero, the analysis showed strong to extremely strong evidence favoring psilocybin on the BDI-1A, MADRS, and HAMD-17, while evidence on the primary outcome (QIDS SR-16) was indeterminate. For clinically meaningful superiority, evidence was moderate against it for the QIDS SR-16 but moderate to strong for the MADRS and HAMD-17. Psilocybin showed extremely strong evidence of noninferiority to escitalopram across all scales. The findings support further research on psilocybin's relative efficacy.
Frontiers in Psychology
May 11, 2023
Hannah Thurgur, Meg J. Spriggs, Ashleigh Murphy-Beiner et al.
13 citations
A framework called Access, Reciprocity and Conduct (ARC) is proposed to build an ethical and equitable infrastructure for psychedelic-assisted therapy (PAT). ARC rests on three pillars: ensuring equal access to PAT for those needing mental health treatment, promoting safety for those delivering and receiving therapy, and respecting traditional and spiritual uses of psychedelic medicines. The framework is being developed through a dual-phase co-design approach, first co-creating ethics statements with stakeholders from research, industry, therapy, community, and Indigenous settings, then inviting broader collaborative review. The authors aim to spark dialogue and help organizations and practitioners address complex ethical questions in PAT.
July 7, 2022
Richard J. Zeifman, Meg J. Spriggs, Hannes Kettner et al.
13 citations
preprint
The Relaxed Beliefs Under pSychedelics (REBUS) model suggests that psychedelics reduce the strength of deeply held beliefs. In a preliminary test of this idea, 11 healthy adults received a low (1 mg) and a high (25 mg) dose of psilocybin four weeks apart. Confidence in negative self-beliefs decreased after the high dose but not after the low dose. Greater brain signal entropy and stronger subjective effects during the high dose correlated with larger decreases in negative belief confidence, both during the session and four weeks later. Reduced confidence in negative beliefs was strongly linked to improved well-being at the four-week follow-up. These findings provide initial psychological support for the REBUS model, though replication in larger and clinical samples is needed.
Frontiers in Psychology
June 6, 2025
William Roseby, Hannes Kettner, Leor Roseman et al.
6 citations
Psychedelics like psilocybin strongly increase the sense that life has meaning, based on three different studies: a clinical trial for depression, a healthy volunteer study, and naturalistic retreats. The 'presence of meaning' rose substantially after a psychedelic experience, while the 'search for meaning' dropped only slightly. These meaning enhancements were moderately linked to improvements in mental health, such as greater wellbeing and reduced depression. Mystical, ego dissolution, and emotional breakthrough experiences were associated with increased meaning, though the strength varied by context. The evidence converges to show a robust, lasting positive effect of psychedelics on meaning in life, with context influencing outcomes.
Neuroscience Applied
December 2, 2024
Kate Godfrey, Brandon Weiss, Joseph Peill et al.
5 citations
A single high dose of psilocybin (25 mg) given to healthy volunteers who had never used psychedelics reduced neuroticism one month later, consistent with prior research. The reduction was linked to how meaningful the experience felt and to the dread of ego dissolution during the drug's acute effects. Personality was measured with the Big Five Inventory and Big Five Aspect Scale; acute effects were tracked with the Altered States of Consciousness questionnaire and Psychological Insight Scale. Electroencephalography measured alpha power and Lempel-Ziv complexity. The findings suggest that acute psychedelic states can catalyze lasting personality changes in a beneficial direction, with implications for therapy and understanding personality.
arXiv (Cornell University)
November 29, 2024
Claudio Agnorelli, Meg J. Spriggs, Kate Godfrey et al.
2 citations
Classic psychedelics (LSD, psilocybin, N,N-DMT) and non-classic psychedelics (ketamine, MDMA) enhance neuroplasticity, the nervous system's ability to adapt. Animal studies indicate these drugs induce meta-plasticity, heightening sensitivity to environmental stimuli, and hyper-plasticity, reopening developmental windows for long-term structural changes that affect mood and behavior. Translating these findings to humans is challenged by limitations in current imaging techniques, but emerging approaches like novel PET radioligands, non-invasive brain stimulation, and multimodal methods offer promising directions. This review informs development of targeted interventions for neuropsychiatric disorders and advances understanding of psychedelics' therapeutic potential.
June 30, 2022
Sandeep M. Nayak, Bilal A. Bari, David B. Yaden et al.
1 citation
preprint
A Bayesian reanalysis of a trial comparing psilocybin (COMP360) to escitalopram for major depressive disorder found that psilocybin outperformed escitalopram, but not by a clinically meaningful amount. The analysis also found extremely strong evidence that psilocybin is non-inferior to escitalopram. Evidence for psilocybin's superiority varied by depression scale: indeterminate for one, strong for two, and extremely strong for another. For a clinically meaningful difference, evidence was moderate against it on one scale, indeterminate on two, and moderate supporting it on one. These results provide a more nuanced interpretation and support further research.
http://isrctn.com/
February 5, 2021
Meg J. Spriggs
No Summary