Your Brain on Shrooms

"Your Brain on Shrooms" is a short AsapSCIENCE explainer on how psilocybin, the main compound in magic mushrooms [/medicine/psilocybe-cubensis], acts on the brain to cause hallucinations and, some studies suggest, lasting mood shifts. Humans have used psilocybin-containing fungi for over 9,000 years, mostly recreationally. The video covers the mechanism, then a US study and a UK harm-comparison study.

How it works

Ingested psilocybin breaks down into psilocin, which blocks serotonin reuptake and, since its structure resembles serotonin, also binds directly to serotonin receptors [/topics/default-mode-network]. This is presented as the source of hallucination: visual, auditory, or mystical sensations with no external stimulus, lasting 3 to 8 hours, though distorted time perception can make it feel longer.

A rearranged brain, and a landmark study

The video describes psilocybin as inhibiting normal brain activity while forming new, temporarily stable connections [/articles/psychedelics-brain-changes], linked to blurred reality, intensified thought, and difficulty planning. It notes activation in the hippocampus and anterior cingulate cortex (tied to dreaming), linked to a sense of expanding consciousness. In a cited US study, 36 college-educated participants took psilocybin under clinical observation: a third called it the most spiritually significant moment of their lives [/topics/mystical-experience], and 79 percent reported greater wellbeing two months later. But 22 percent also reported fear or paranoia during the session [/articles/psychedelic-safety-harm-reduction].

Where the video lands

Psilocybin is not considered clinically addictive and shows little organ toxicity. A cited UK study ranked mushrooms as the least harmful, to users and others, among recreational drugs compared. The video closes on scientists' view that current laws limit the research needed to map its benefits and risks.

Key takeaways

• ●Psilocybin converts to psilocin, which blocks serotonin reuptake and stimulates serotonin receptors directly.
• ●Effects typically last 3 to 8 hours; altered time perception can make a session feel longer.
• ●The brain temporarily "rearranges": normal activity inhibited while new connections form.
• ●Activation is noted in the hippocampus, anterior cingulate cortex, and emotional centers.
• ●A third of 36 US study participants called their session the most spiritually significant of their lives.
• ●79 percent reported greater wellbeing two months later; 22 percent reported fear or paranoia during the session.
• ●A UK study ranked psilocybin mushrooms the least harmful among recreational drugs compared.
• ●Not considered clinically addictive; scientists cited see current laws as a research barrier.