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W. Keith Campbell

4 papers in the library · 69 citations · publishing 2020-2026

Papers

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Effects of an international ceremonial ayahuasca retreat on the diversity and community composition of the human gut microbiome: A preliminary observational single-arm pre-post study

Brain Behavior and Immunity Integrative July 1, 2026 Lyanna R. Kessler, Lamya'a Dawud, John D. Sterrett et al.

ABSTRACT Posttraumatic stress disorder (PTSD) is a mental health condition that can develop following exposure to a traumatic event, often with persistent anxiety and depressive symptoms. Recent research suggests the microbiome-gut-brain axis may play an important role in the etiology and pathophysiology of PTSD. At the same time, retreats incorporating psychedelic-assisted therapies have...

Perceptions of psychedelic personality change, determinants of use, setting and drug moderation: Toward a holistic model

Journal of Psychedelic Studies December 8, 2023 Brandon Weiss, Chelsea Sleep, Nicholas M. Beller et al. 11 citations

Abstract Background Studies have shown evidence for long-term effects of psychedelics on personality, but comprehensive models of psychedelic-mediated personality changes have yet to be explored. Aims The present study aims to investigate (1) perceptions of personality change in the general population, (2) moderators of perceived personality change including setting and drug type, and (3)...

Prospective examination of the therapeutic role of psychological flexibility and cognitive reappraisal in the ceremonial use of ayahuasca

Journal of Psychopharmacology March 1, 2022 Gabrielle Agin-Liebes, Richard J. Zeifman, Jason B. Luoma et al. 51 citations

Background: Evidence suggests that psychedelic-assisted therapy carries transdiagnostic efficacy in the treatment of mental health conditions characterized by low mood and the use of avoidance coping strategies. Aims: While preliminary evidence suggests that psychological flexibility and emotion regulation processes play an important role within psychedelic therapy, this prospective study...

Examining Changes in Personality Following Shamanic Ceremonial Use of Ayahuasca

Research Square (Research Square) November 30, 2020 Brandon Weiss, Joshua D. Miller, Nathan T. Carter et al. 7 citations

Abstract The present study examines the association between the ceremonial use of ayahuasca – a decoction combining the Banistereopsis caapi vine and N,N Dimethyltryptamine-containing plants – and changes in personality traits as conceived by the Five-Factor model (FFM); as well as the degree to which demographic characteristics, baseline personality, and acute post-ayahuasca experiences affect...