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Anthony J. Cleare

NIHR Biomedical Research Centre at The Royal Marsden and the ICR

5 papers in the library · 303 citations · publishing 2022-2025

Papers

Psychedelics, Mystical Experience, and Therapeutic Efficacy: A Systematic Review

Frontiers in Psychiatry July 12, 2022 Kwonmok Ko, Gemma Knight, James Rucker et al. 296 citations

Mystical experience—characterized by oceanic boundlessness, ego dissolution, and universal interconnectedness—may be a psychological mechanism influencing outcomes in psychedelic therapy. A review of 12 studies using psilocybin, ayahuasca, or ketamine found that 10 reported a significant association (correlation, mediation, or prediction) between mystical experience and symptom reduction across cancer-related distress, substance use disorder, and depressive disorders including treatment-resistant depression. However, most studies had small, non-diverse samples, and half were open-label, introducing potential bias. Future research needs larger, more diverse randomized designs and deeper exploration of mystical experience's nature and predictors to maximize therapeutic benefits while minimizing anxiety.

Participants’ Experience of Psychedelic Integration Groups and Processes: A Qualitative Thematic Analysis

Psychedelic Medicine November 26, 2024 Nadav Liam Modlin, Tyler McPhee, Nira Zazon et al. 5 citations

People who use psychedelics and attend integration groups report that these groups provide essential community support and help process psychedelic experiences, but also face challenges such as managing group dynamics and ensuring facilitators are adequately trained. Three main themes emerged: reasons for attending, utility of the groups, and adverse factors affecting experience. While integration groups can reduce some risks of unregulated psychedelic use, research is needed to develop standardized protocols and facilitator training to improve their safety and effectiveness.

Clinical conceptualisation of PTSD in psilocybin treatment: disrupting a pre-determined and over-determined maladaptive interpretive framework

Therapeutic Advances in Psychopharmacology June 8, 2025 Nadav Liam Modlin, Victoria Williamson, Carolina Maggio et al. 1 citation

PTSD is a common and debilitating condition that current treatments only partially address. This review examines psilocybin, a classical psychedelic, as a potential therapeutic agent. It synthesizes recent literature on psychedelic therapies for trauma-related conditions, including treatment-resistant depression and end-of-life anxiety. The authors propose a conceptual framework viewing PTSD as a maladaptive interpretive framework that psilocybin may disrupt through its psychopharmacological properties and subjective effects. A clinical narrative illustrates this process. Recommendations emphasize rigorous, trauma-informed protocols for safe administration in medical research settings.

Perspectives on Trauma Treatment, Self-Management Strategies, and Attitudes Toward Psychedelic Therapies in Individuals with Psychological Trauma Symptoms

Psychiatry and Clinical Psychopharmacology August 14, 2025 Nadav Liam Modlin, Jessica L. Maples‐keller, Maria Sarang et al.

Among 873 people who reported trauma symptoms or a PTSD/CPTSD diagnosis, 94.8% had experienced psychological trauma and 73.4% had a formal diagnosis. Many had tried multiple medications and psychotherapies but were highly dissatisfied. Significant numbers used marijuana, psychedelics, or MDMA on their own to manage symptoms, with few physical or psychological complications. After learning about MDMA and psilocybin therapies, willingness to try them was high (0.81 and 0.83, respectively). Women and heterosexual individuals showed lower willingness, while younger and more educated respondents were more willing. The findings point to a need for further clinical research and public education about risks and harm reduction.