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Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Complexity Science

Background:

  • Psychedelics profoundly impact subjective experience and brain dynamics.
  • Brain oscillations exhibit near-critical dynamics crucial for healthy brain function.
  • Altered criticality is hypothesized to underlie psychedelic effects.

Purpose of the Study:

  • Investigate the effects of Dimethyltryptamine (DMT) on brain oscillation criticality.
  • Relate these changes to subjective experiences in humans.
  • Determine the direction of criticality shift induced by DMT.

Main Methods:

  • Human participants administered DMT.
  • Analysis of brain oscillations, focusing on alpha and adjacent frequency bands.
  • Utilized a functional excitatory-inhibitory ratio metric to assess criticality.

Main Results:

  • DMT shifted brain oscillations away from criticality in alpha and theta bands.
  • Observed increased entropy and reduced complexity in brain dynamics.
  • Criticality shifts correlated with the intensity of self-dissolution experiences.
  • DMT-induced shifts moved brain dynamics towards subcritical regimes.

Conclusions:

  • DMT alters brain dynamics by moving them away from criticality.
  • These neurological changes are linked to key subjective psychedelic effects.
  • Findings offer insights into psychedelic mechanisms and altered states of consciousness.