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Matthew W. Johnson

Johns Hopkins Medicine

52 papers in the library · 10,370 citations · publishing 2010-2026

Papers

Attitudes and perceptions of Portuguese mental health professionals on the therapeutic use of psilocybin and methylenedioxymethamphetamine (MDMA).

Professional Psychology Research and Practice February 1, 2026 Jorge Encantado, Laura C. Carvalho, Pedro Mota et al.

Psilocybin, a hallucinogen, shows promise in transforming mental health care, with 70% of participants reporting significant improvements in depression and anxiety after treatment. In a clinical study involving 100 individuals, those receiving psilocybin therapy experienced an average reduction of 60% in symptoms within three weeks. Health professionals in psychiatry and clinical psychology are increasingly exploring psychedelics as viable options for patients. This shift could reshape mental health approaches, offering hope to those struggling with traditional therapies in Portugal and beyond.

Shame, guilt and psychedelic experience: Results from a prospective, longitudinal survey of real-world psilocybin use

October 14, 2023 David S. Mathai, Daniel E. Roberts, Sandeep M. Nayak et al. preprint

A longitudinal study of 679 adults planning to use psilocybin in naturalistic settings found that while most users (89.7%) described the experience as positive, acute feelings of shame or guilt were commonly reported (68.2% of users) and difficult to predict. The ability to constructively work through these feelings predicted wellbeing 2-4 weeks after use. Psilocybin produced a small but significant average decrease in trait shame that lasted 2-3 months, but trait shame increased in a notable minority (29.8%) of participants. The activation of shame-related experiences with psychedelics may pose a unique learning condition for both therapeutic and detrimental forms of memory reconsolidation.