Psychological Medicine
March 3, 2016
Ravi Das, Amanda J. F. Tamman, Viktoriya L. Nikolova et al.
48 citations
Inhaling nitrous oxide shortly after a traumatic event speeds the decline of intrusive memories, reducing them by the next day compared to four days later with medical air. The gas appears to disrupt memory consolidation, but it increases intrusive memories in people who were highly dissociated at the time of the trauma. Sleep quality did not differ between groups. The findings suggest nitrous oxide may help prevent PTSD symptoms in some individuals, but caution is warranted for those with dissociation.
Journal of Psychopharmacology
May 18, 2015
Sunjeev K. Kamboj, Emma J. Kilford, Stephanie Minchin et al.
43 citations
MDMA (ecstasy) and compassionate imagery both increase self-compassion and reduce self-criticism in recreational users. In a non-blind experiment, participants who consumed ecstasy showed similar pro-social effects to those produced by a contemplative compassion exercise, particularly in those with higher attachment-related avoidance. The findings suggest MDMA may enhance psychotherapy by fostering compassionate attitudes toward oneself. However, because the study was not blinded and drug purity was unknown, controlled trials with pharmaceutical-grade MDMA are needed to confirm these effects.
Mindfulness
November 4, 2017
Sunjeev K. Kamboj, Ylva Walldén, Caroline J. Falconer et al.
27 citations
In a naturalistic setting, recreational users who consumed chemically verified MDMA performed a self-focused compassionate imagery exercise on two separate occasions: once after taking MDMA and once without. The exercise and MDMA each independently increased emotional empathy toward critical facial expressions and self-compassion, and their effects on self-compassion appeared to add together. The findings suggest that combining MDMA with compassionate imagery may enhance self-directed affiliative feelings, though controlled studies are needed to confirm the combined utility for therapeutic contexts.
Scientific Reports
February 8, 2024
Rosalind McAlpine, George Blackburne, Sunjeev K. Kamboj
24 citations
A new 20-item Psychedelic Preparedness Scale (PPS) was developed and validated to measure how well participants are prepared for psychedelic experiences. Using an iterative Delphi-focus group method and input from clinicians, researchers, and psychedelic users, the scale identifies four factors: Knowledge-Expectations, Intention-Preparation, Psychophysical-Readiness, and Support-Planning. In two large online samples (N = 516 and N = 716) and a psilocybin retreat group (N = 46), the PPS showed excellent reliability and evidence for convergent, divergent, and discriminant validity. People scoring higher on preparedness before a psychedelic experience had better mental health and wellbeing outcomes afterward, indicating the scale can predict who may benefit or be less likely to experience harm.
April 28, 2023
Rosalind McAlpine, George Blackburne, Sunjeev K. Kamboj
22 citations
preprint
A new 20-item Psychedelic Preparedness Scale (PPS) measures how well participants are prepared for psychedelic experiences, addressing a gap in available assessment tools. Developed using an iterative Delphi-focus group method and validated in two large online samples (N = 516 and N = 716) plus a psilocybin retreat group (N = 46), the scale identifies four factors: Knowledge-Expectations, Intention-Preparation, Psychophysical-Readiness, and Support-Planning. It shows excellent reliability (ω = 0.954) and evidence of convergent, divergent, and discriminant validity. Higher pre-experience preparedness scores predicted better mental health and wellbeing outcomes after the experience, indicating the scale's predictive utility for assessing participants' psychological 'set' and potential benefit or reduced harm.
Psychopharmacology
March 26, 2022
Giulia Piazza, G. Iskandar, V. Hennessy et al.
14 citations
Nitrous oxide (N2O) produces dissociative and psychosis-like effects comparable to those of ketamine in healthy volunteers, making it a practical alternative for modeling these experiences outside clinical settings. Analysis of data from three previous studies found that the Clinician Administered Dissociative States Scale (CADSS) and Psychotomimetic States Inventory (PSI) capture largely non-overlapping subjective experiences during N2O inhalation. A three-factor model of dissociation was confirmed, though a two-factor model may be more parsimonious. Psychosis-like symptoms were represented by two negative and two positive symptom factors. The findings suggest both measures should be used together to comprehensively assess anomalous states from dissociative NMDAR antagonists.
Scientific Reports
February 19, 2024
Rosalind McAlpine, Matthew D. Sacchet, Otto Simonsson et al.
13 citations
A 21-day self-directed digital course (DIPP) was co-designed to improve psychedelic preparation. The intervention, built on a four-factor model of psychedelic preparedness, was developed through two mixed-methods studies: interviews with 19 past high-dose psilocybin retreat attendees and co-design workshops with 28 current retreat participants. The course includes daily meditation, weekly module exercises, and mood tracking. The authors suggest DIPP offers a scalable, comprehensive tool to enhance safety and therapeutic benefits by addressing knowledge, psychophysical readiness, safety planning, and intention.
Cell Reports
July 22, 2025
George Blackburne, Rosalind McAlpine, Marco S. Fabus et al.
10 citations
Inhaling a high dose of vaporized synthetic 5-MeO-DMT radically reorganizes low-frequency brain oscillations, making them heterogeneous, viscous, and nonrecurring, and halting their typical forward and backward travel across the cortex. This reorganization also causes broadband neural activity to become more stable and low-dimensional, with increased energy barriers for rapid global shifts. These findings, based on EEG data from 29 healthy individuals, provide a detailed account of how the drug sculpts human brain dynamics and reveal atypical cortical slow-wave behaviors relevant to neuroscientific models of serotonergic psychedelics.
Psychopharmacology
February 1, 2025
Jack Stroud, Charlotte Rice, Aaron Orsini et al.
8 citations
The majority of autistic participants who completed an online survey reported that their most impactful psychedelic experience reduced psychological distress (82%) and social anxiety (78%) and increased social engagement (70%). A substantial minority (20%) reported undesirable effects such as increased anxiety, with some describing the experience as among the most negatively impactful of their lives. The only substantial predictor of reduced distress was increased psychological flexibility. The findings come from a non-experimental design with biased sampling, so caution is warranted.
bioRxiv (Cold Spring Harbor Laboratory)
October 7, 2024
George Blackburne, Rosalind McAlpine, Marco S. Fabus et al.
8 citations
preprint
A high dose of the psychedelic drug 5-MeO-DMT radically reorganizes low-frequency brain activity in 29 healthy individuals. Inhaling 12 mg of vaporized synthetic 5-MeO-DMT caused neural activity flows to become incoherent, heterogeneous, viscous, fleeting, and nonrecurring, ceasing typical traveling waves across the cortex. This reorganization led to slower, more stable, low-dimensional broadband activity with increased energy barriers to rapid global shifts. The findings provide the first detailed empirical account of how 5-MeO-DMT alters human brain dynamics, revealing novel cortical slow wave behaviors.
Biological Psychiatry Global Open Science
July 1, 2025
Benjamin Brake, Lillian Wieder, Natasha Hughes et al.
5 citations
Dissociative states—disruptions in awareness and perception—occur across many psychiatric conditions and can be modeled in the lab. A meta-analysis of 123 studies (6,692 individuals) measured state dissociation using a standardized scale. At baseline, the largest effects were in dissociative and complex subtypes of posttraumatic stress disorder. In controlled experiments, mirror gazing and several drugs, particularly ketamine and cannabis, induced dissociation as high as or higher than that seen in PTSD. Results were highly variable across studies but not explained by methodological differences. These findings validate experimental methods for inducing dissociation and inform monitoring of adverse events in drug-based interventions.
Mindfulness (N Y)
September 26, 2025
Saampras Ganesan, Nicholas T. van Dam, Sunjeev K. Kamboj et al.
3 citations
A 7-Tesla MRI study found that neurofeedback training (NFT) helps people become more aware of their mental states and boosts emotional well-being during real-world meditation. Participants who received NFT showed improved self-awareness and greater emotional benefits from meditation compared to those who did not receive NFT. The results suggest that NFT can enhance the positive effects of meditation practice.
bioRxiv (Cold Spring Harbor Laboratory)
October 26, 2024
Saampras Ganesan, Nicholas T. van Dam, Sunjeev K. Kamboj et al.
3 citations
preprint
Personalized high-precision neurofeedback (NF) can help novice meditators better disengage from mental activity during meditation, improving emotional well-being and mindful awareness. In a single-blind, controlled study, 40 novices received two days of meditation training with feedback from either their own or a matched participant's posterior cingulate cortex (PCC) activity, measured using 7 Tesla fMRI. The experimental group showed stronger functional decoupling of PCC from dorsolateral prefrontal cortex, indicating improved control over disengagement. This led to greater improvements in emotional well-being and mindful awareness during a week of real-world self-guided meditation, supporting the utility of NF-guided meditation training.
Neuroscience and Biobehavioral Reviews
July 1, 2026
Marcus J. Glennon, Catherine Bird, Prateek Yadav et al.
2 citations
Setting up a psychedelic research study involves a long, arduous, and Kafkaesque process with many unstandardised challenges. These complexities challenge existing assumptions about psychiatric prescribing, the placebo effect, and definitions of selfhood. This review brings together major UK psychedelic research teams to formalise these unique considerations, addressing sociocultural, political, legal, pharmacological, safety, study design, and experiential facets. It identifies continuing areas of debate and provides a practical, experience-based guide with recommendations for policymakers and future researchers intending to set up a psychedelic study or clinical trial.
February 6, 2025
Rosalind McAlpine, Merve Utanğaç, Joanna Kuć et al.
2 citations
preprint
Experienced meditators who also use psychedelics expect meditation to enhance acceptance and present-moment focus during psychedelic sessions, while increasing feelings of oceanic boundlessness and reducing anxious ego-dissolution. Among those with limited meditation experience (1-3 years) and few psychedelic sessions (1-20), adhering to a specific meditation tradition was linked to higher perceived benefits of meditation for psychedelic preparation. However, for highly experienced meditators (10+ years) with limited psychedelic use, non-adherents reported higher perceived benefits. Loving-Kindness Meditation was rated the most beneficial preparatory practice. Participants recommended about three weeks of daily 30-minute sessions, favoring online and asynchronous delivery.
medRxiv
September 10, 2024
Benjamin Brake, Lillian Wieder, Natasha Hughes et al.
2 citations
preprint
Dissociative states—disruptions in awareness and perception—occur across many psychiatric disorders and can be experimentally induced. This meta-analysis of 123 studies (6,692 individuals) measured state dissociation using a standard scale. At baseline, the largest effects were in dissociative and complex subtypes of post-traumatic stress disorder (PTSD-DC). In controlled experiments, mirror-gazing and several drugs (especially ketamine and cannabis) produced dissociation levels as high as or higher than baseline PTSD-DC. Effect sizes varied widely but were not consistently linked to study methods. The findings confirm that dissociation can be reliably modeled in the lab, with implications for measuring side effects and predicting outcomes in drug-based treatments.
European Journal of Psychotraumatology
December 1, 2026
V Ursule Taujanskaite, Sunjeev K. Kamboj
A 6-item short form of the Clinician Administered Dissociative States Scale (CADSS-SF) was developed using data from three studies of nitrous oxide in 229 healthy volunteers, then validated in 80 separate participants. The single-factor scale, composed of derealization and depersonalization items, showed excellent model fit and internal consistency (omega = 0.87), correlated strongly with the full 19-item CADSS (r ≥ 0.88), and moderately with a measure of psychotomimesis (r = 0.63). The CADSS-SF enables rapid, repeated assessment of dissociation during drug intoxication without disrupting the experience, but primarily captures derealization and depersonalization and requires further validation beyond drug-induced dissociation in healthy populations.
PLoS One
June 18, 2026
Elisa Liberati, Hv Curran, Peter Fonagy et al.
MDMA-assisted psychotherapy shows promise for treating PTSD, but the psychological mechanisms behind its effects are not well understood. This qualitative study will have approximately 25 experienced psychodynamic psychotherapists receive two doses of MDMA (80-120 mg, oral) in an open-label design. Participants will complete interviews before, during, and after MDMA sessions, plus daily journals. Researchers will use phenomenological and thematic analysis, along with grounded theory, to develop a model of MDMA's psychological mechanisms of action. The study treats therapists as expert observers of their own psychological processes, aiming to generate insights that can inform future treatment models and offer a framework for qualitative mechanistic research on psychedelics.
BMJ Open
March 12, 2026
Rosalind McAlpine, Magdalena Jaglinska, Krisztina Jedlovszky et al.
A 21-day mobile-accessible programme called the Digital Intervention for Psychedelic Preparation (DIPP) is being tested for feasibility and preliminary efficacy in a randomised controlled trial. The study will recruit 40 non-treatment-seeking adults without a clinical diagnosis, randomly assigning them to either a guided meditation with music condition or a music-only condition. After the digital intervention, all participants will attend an in-person supervised psilocybin session with a standardised 25 mg dose. Primary outcomes include recruitment efficiency, retention, and adherence; secondary outcomes assess preparedness, quality of the psychedelic experience, and wellbeing, with follow-ups up to 9 months. The trial is registered as NCT06815653.
Open Science Framework
January 1, 2026
Christina Chwyl, M. Kati Lear, Sunjeev K. Kamboj et al.
Self-compassion is thought to be important for mental health, especially for people with social anxiety disorder. MDMA-assisted therapy may work by increasing self-compassion. This study will examine whether trait self-compassion rises during treatment and whether self-compassion felt during MDMA dosing sessions leads to lasting changes. It will also test if changes in self-compassion relate to improvements in social anxiety, depression, shame, functioning, and belonging. Five specific aims are outlined to explore these relationships across two dosing sessions.
Open Science Framework
October 20, 2025
Natalia Fernandez‐Vinson, Roger Atkins, Marcus J. Glennon et al.
This registered clinical study investigates whether N,N-dimethyltryptamine (DMT), alone or combined with reactivating alcohol-related memories, can produce lasting changes in the brain, cognition, and drinking behavior in people with mild alcohol use disorder who are hazardous drinkers but not seeking treatment. Up to 120 participants will be assigned to one of four groups: alcohol memory retrieval plus DMT, alcohol memory retrieval plus placebo, control memory retrieval plus DMT, or control memory retrieval plus placebo. Drinking levels will be measured over three lab sessions and a nine-month follow-up using timeline follow-back and blood tests.
Psychological Medicine
January 1, 2025
Sunjeev K. Kamboj, Matthew Peniket, Jessica Norman et al.
Transcutaneous vagus nerve stimulation (tVNS) combined with a brief self-compassion mental imagery training (SC-MIT) produced a larger acute increase in state self-compassion and mindfulness than either intervention alone in healthy adults. Over eight daily sessions, tVNS plus SC-MIT showed accumulating effects on mindfulness but not self-compassion. Self-criticism and attentional bias toward compassionate faces were influenced only by the type of imagery training, not by stimulation. Heart rate variability was unaffected by any condition. The findings suggest tVNS may enhance meditation-based psychotherapies, while oculomotor metrics appear sensitive to self-compassion training.
Scientific Reports
November 21, 2024
Maximillian J. Wood, Rosalind McAlpine, Sunjeev K. Kamboj
People who have difficult experiences while using psychedelics can benefit from specific coping strategies. A mixed-methods study of psilocybin retreat participants and a larger online survey identified three main ways people navigate challenging psychedelic experiences: accepting and reinterpreting the experience, regulating through sensory and physical interaction, and seeking social support. Acceptance and reappraisal, along with social support and disclosure, were linked to greater emotional breakthrough. Fear-related challenges were associated with less emotional breakthrough and fewer adaptive coping strategies. These findings clarify how challenging experiences can lead to positive outcomes and suggest ways to improve therapeutic protocols and safety.
November 22, 2023
Rosalind McAlpine, Katarina Krajnović, Maisha M. Khan et al.
preprint
A self-directed, 21-day digital course (Digital Intervention for Psychedelic Preparation, DIPP) was developed to help people prepare for psychedelic experiences. The course is based on a four-factor model of psychedelic preparedness: Knowledge-Expectation, Psychophysical-Readiness, Safety-Planning, and Intention-Preparation. It includes daily meditation, weekly exercises, and mood tracking. Development followed the UK Medical Research Council framework for complex interventions and used a person-centred, co-design approach. Interviews with 19 past retreat attendees and co-design workshops with 28 current retreat attendees shaped the intervention. DIPP offers a scalable, digital solution to enhance preparedness, aiming to limit adverse reactions and improve therapeutic benefits.
arXiv Preprint Archive
March 28, 2025
Marcus J. Glennon, Catherine Bird, Prateek Yadav et al.
Setting up a psychedelic study is a long and complex process that presents unique challenges not yet standardized. This review brings together major UK research teams to formalize these considerations, identify ongoing debates, and provide a practical guide for researchers and policymakers. It addresses challenges to existing assumptions about psychiatric prescribing, the placebo effect, and definitions of selfhood. The paper can be read end-to-end or used as a manual with sections for specific needs.