Mapping the mind's response. What Psilocybin Actually Does to the Human Brain: New Research Reveals Measurable Changes After a Single Dose A landmark 2026 study published in Nature Communications used EEG and MRI to track what happens to the human brain in the hours, weeks, and months after a first high-dose psilocybin experience. The findings are the clearest evidence yet that psilocybin produces real, measurable neurological changes — not just subjective ones. Category: R