A single dose of psilocybin appears to trigger brain network changes that persist for weeks, with altered connectivity tied to neurotransmitter systems and subjective effects

Psilocybin appears to induce measurable brain network changes that last for weeks after a single dose. Functional MRI data from healthy volunteers suggest altered connectivity in attention, default mode, and executive systems, with effects that remain detectable well beyond the acute psychedelic state. Those changes are linked to serotonin receptor rich regions and to the intensity of subjective experiences, pointing to a possible mechanism for how a brief intervention can produce longer-lasting shifts in perception and cognition. The findings add to evidence that psilocybin can temporarily increase brain flexibility and may help explain why psychedelic treatments are being studied for depression and related conditions. The results come from a small study and do not establish clinical benefit on their own, but they strengthen the case that psilocybin's effects extend beyond hours-long intoxication into enduring changes in brain organization.