Psilocybin-induced alterations in EEG power, connectivity and network dynamics in healthy subjects: Correlations with subjective experience and implications for therapeutic applications

Jan 29, 2026Progress in neuro-psychopharmacology & biological psychiatry

Changes in brain activity and connections caused by psilocybin in healthy people linked to their experiences and possible therapy uses

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Abstract

Psilocybin significantly decreased EEG power in slow frequency bands and increased it in fast frequency bands compared to placebo.

  • Psilocybin administration resulted in decreased power in theta and alpha frequency bands.
  • There was an increase in power in beta, gamma1, and gamma2 frequency bands following psilocybin administration.
  • Connectivity within the default-mode network and localized parietal network increased under psilocybin.
  • Subjective experiences correlated positively with EEG power and connectivity changes during psilocybin use.
  • Baseline EEG features may predict individual subjective experiences during psilocybin therapy.

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