New research shows that the active ingredient in hallucinogenic mushrooms, called psilocybin, could affect the brain long after it has left the user’s system. To date, most studies of this type focused on the acute effects of psilocybin — or how the brain functioned while under the influence of the drug. In this study, published in the journal Scientific Reports, researchers instead looked at the enduring effects of the drug. According to Fredrick S. Barrett, an assistant professor at Johns Hopkins University School of Medicine, and one of the authors of the study: Nearly all psychedelic imaging studies have been…

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