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Decreased directed functional connectivity in the psychedelic state.

Lionel Barnett1, Suresh D Muthukumaraswamy2, Robin L Carhart-Harris3

  • 1Sackler Centre for Consciousness Science and Department of Informatics, University of Sussex, Falmer, Brighton, BN1 9QJ, UK.

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Summary
This summary is machine-generated.

Psychedelic drugs like LSD and psilocybin decrease directed brain connectivity, suggesting a breakdown in neural organization. This neuroimaging study reveals altered information flow during the psychedelic state.

Keywords:
Granger causalityInformation flowNeural dynamicsPsychedelic state

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Area of Science:

  • Neuroscience
  • Psychopharmacology

Background:

  • Neuroimaging studies explore the neural basis of consciousness and selfhood.
  • Large-scale neural dynamics induced by psychedelics are not fully understood.

Purpose of the Study:

  • To investigate changes in functional brain connectivity under psychedelics.
  • To compare directed and undirected connectivity measures.

Main Methods:

  • Used source-localised, steady-state MEG recordings.
  • Administered LSD, psilocybin, low-dose ketamine, and tiagabine.
  • Compared Granger causality, correlation, and coherence.

Main Results:

  • All three psychedelics decreased directed functional connectivity (Granger causality).
  • LSD showed decreased directed and increased undirected connectivity (correlation, coherence).
  • Results suggest a breakdown in brain functional organization or information flow.

Conclusions:

  • Psychedelic states involve altered neural dynamics and information flow.
  • Comparing multiple connectivity measures is crucial for time-resolved neuroimaging data analysis.