Health Affairs Scholar
August 27, 2026
Danielle R Adams, Morgan Hartman, Lisa Gong et al.
Abstract Introduction Oregon is the first US state to permit supervised psilocybin services through a nonmedical, wellness-based model. We examined what prospective clients with psychiatric histories encounter when contacting service centers, including how staff communicate about safety, eligibility, and cost. Methods We conducted a mystery shopper study of 26 licensed service centers in Oregon...
Proceedings of the National Academy of Sciences of the United States of America
June 16, 2026
Adam R Pines, Xue Zhang, John Kochalka et al.
Psychedelic drugs are poised to become mainstream treatments, yet we lack a circuit-level account of how they reshape brain activity. Emerging evidence suggests that multiple psychedelic compounds modulate activity in the brain's default mode network (DMN), often interpreted as either increased or decreased bottom-up hierarchical processing. Most imaging studies, however, quantify activity as...
The Journal of Clinical Psychiatry
June 10, 2026
Jacob T. Steinle, Suraj Shankar, Joshua S. Siegel et al.
Background: Current drug policy debates often center on whether hallucinogen-related hospital admissions indicate a causal relationship with psychosis. This study examines the extent to which observed associations between hallucinogen use and psychosis are mediated by preexisting psychiatric conditions, providing important evidence for psychedelic policy formulation. Methods: We conducted a...
Nature Medicine
April 1, 2026
Manesh Girn, Manoj K. Doss, Leor Roseman et al.
8 citations
Psychedelic drugs are re-emerging as promising scientific and clinical tools. However, despite a rapidly expanding literature on their therapeutic value, the neural mechanisms underlying psychedelic effects remain unclear. Resting-state functional magnetic resonance imaging studies of acute psychedelic effects, conducted independently by several research groups, have so far yielded fragmented...
Nature Medicine
February 6, 2026
Joshua S. Siegel, Conor Liston, Ginger E. Nicol et al.
10 citations
Classic psychedelics typically act at the serotonin 5-HT2A receptor to profoundly alter brain function and consciousness. Research on these compounds has accelerated. Major strides have been made in understanding their unique mechanisms of action and clinical potential. This Review outlines the state of psychedelic science, spanning cellular mechanisms, systems neuroscience and clinical...
JAMA Network Open
November 13, 2025
Jacob T. Steinle, Lisa Gong, Joanna L. Buss et al.
This cohort study evaluates trends in emergency department (ED) visits and hospitalizations related to hallucinogen use in the United States.
Psychopharmacology
October 27, 2025
David A Bender, Sandeep M. Nayak, Joshua S. Siegel et al.
Psychedelic treatments are considered to involve unique treatment challenges relative to other psychiatric interventions, though these are typically not explored in detail within clinical trial reports. To determine the types of challenges that providers encounter while administering psychedelic drugs in research settings and to assess provider opinions on safeguards that may be pursued to...
Nature Neuroscience
October 13, 2025
Jonah A. Padawer-Curry, Oliver J. Krentzman, Chao‐cheng Kuo et al.
9 citations
Human neuroimaging studies report that psychedelics induce serotonin-2A receptor-dependent changes in functional brain reorganization, presumably reflecting neuromodulation. However, these studies often overlook the potent vasoactive effects of serotonin. Here we identified psilocybin-induced alterations in hemodynamic response functions during human functional magnetic resonance imaging,...
Scientific Data
June 5, 2025
Subha Subramanian, Travis Rick Renau, Demetrius Perry et al.
4 citations
Psilocybin (PSIL) is a psychedelic drug and a promising experimental therapeutic for many psychiatric conditions. Precision functional mapping (PFM) combines densely repeated resting state fMRI sampling and individual-specific network mapping to improve signal-to-noise ratio (SNR) and effect size in brain imaging research. We present a randomized cross-over study in which PFM was used to...
American Journal of Psychotherapy
May 6, 2025
David A Bender, Sandeep M. Nayak, Joshua S. Siegel et al.
7 citations
Psychedelic therapies are promising new treatment options in psychiatry. Including the use of physical touch as part of treatment is an area of debate. This study aimed to characterize the viewpoints of practitioners on the use of touch in psychedelic therapy. An anonymous survey was distributed via e-mail to the contacts listed on ClinicalTrials.gov for trials of psilocybin and lysergic acid...
The Journal of Clinical Psychiatry
February 5, 2025
David A Bender, Sandeep M. Nayak, Joshua S. Siegel et al.
3 citations
Objective: To assess the viewpoints of psychedelic practitioners in research settings on approaches to psychological support for psychedelic treatments. Methods: An anonymous survey was distributed via email to contacts listed on ClinicalTrials.gov for clinical trials of psilocybin and LSD, personal contacts of authors, and through snowball sampling. The survey included Likert type, multiple...
Nature
August 1, 2024
Joshua S. Siegel, Subha Subramanian, Demetrius Perry et al.
241 citations
A single dose of psilocybin, a psychedelic that acutely causes distortions of space-time perception and ego dissolution, produces rapid and persistent therapeutic effects in human clinical trials1-4. In animal models, psilocybin induces neuroplasticity in cortex and hippocampus5-8. It remains unclear how human brain network changes relate to subjective and lasting effects of psychedelics. Here...
Biological Psychiatry
April 29, 2024
Joshua S. Siegel, Subha Subramanian, Nico U.f. Dosenbach et al.
14 citations
1 Summary The relationship between the acute effects of psychedelics and their persisting neurobiological and psychological effects is poorly understood. Here, we tracked brain changes with longitudinal precision functional mapping in healthy adults before, during, and for up to 3 weeks after oral psilocybin and methylphenidate (17 MRI visits per participant) and again 6+ months later....
Missouri medicine
2023
Joshua S. Siegel, Craig S Pearson, Eric J Lenze
592 citations
The 21st century has brought novel therapies and new therapeutic targets for major depressive disorder (MDD). Until recently all antidepressant medications targeted monoamines-serotonin, norepinephrine, and dopamine- and their regulatory systems. But growing evidence has suggested that individuals who fail to respond to a monoaminergic treatment are likely to fail to respond to other...
JAMA Psychiatry
December 7, 2022
Joshua S. Siegel, James E. Daily, Demetrius Perry et al.
168 citations
Importance Psychedelic drugs are becoming accessible in the US through a patchwork of state legislative reforms. This shift necessitates consensus on treatment models, education and guidance for health care professionals, and planning for implementation and regulation. Objective To assess trends in psychedelics legislative reform and legalization in the US to provide guidance to health care...