EEG Study Links Psilocybin-Induced Brain Dynamics to Acute Experience and Long-Term Psychological Changes
A small double-blind, placebo-controlled study found that psilocybin altered the temporal dynamics of large-scale brain activity as measured by EEG microstates, with faster transitions between brain states during peak intoxication. Individual differences in these neural dynamics correlated with both the intensity of the acute psychedelic experience and self-reported psychological changes 28 days later. The findings suggest EEG microstates could serve as objective neural markers connecting the acute psychedelic state to longer-term outcomes, which is relevant to ongoing research into psilocybin's therapeutic potential.
Researchers conducted a double-blind, randomized, placebo-controlled crossover study in 15 healthy volunteers to examine how psilocybin affects EEG-measured brain microstate dynamics — rapid patterns of large-scale neural activity measurable at millisecond resolution. During peak intoxication (50–100 minutes post-administration), psilocybin significantly increased the number of global field power peaks and reduced microstate lifespan while increasing how frequently microstates occurred, indicating accelerated transitions between brain states. Importantly, the overall coverage of canonical brain states was largely preserved, suggesting that psilocybin alters the timing of brain state transitions rather than eliminating access to the brain's normal repertoire of activity patterns. Individual differences in these microstate dynamics during peak intoxication correlated with both the subjective intensity of the psychedelic experience and self-reported psychological changes measured 28 days after administration. The study used both data-driven (three-microstate) and canonical (four-microstate) analytical approaches, with EEG recorded at five time points spanning baseline, peak intoxication, and recovery. The authors describe the link between acute neural dynamics and longer-term outcomes as exploratory evidence, given the small sample size. These results position EEG microstates as candidate biomarkers for psychedelic-induced alterations in consciousness with potential utility in therapeutic research.
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- bioRxivCenter
EEG microstate dynamics during psilocybin intoxication relate to acute experience and persisting psychological changes
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