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Hallucinogens are psychoactive substances that profoundly alter perceptual experiences, generating unreal visual and sensory images. Often referred to as psychedelic drugs — a term derived from the Greek words "psyche" (mind) and "delos" (revealing) — these substances include marijuana and lysergic acid diethylamide (LSD), among others. These drugs vary in intensity and effects.
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Psilocybin alters visual contextual computations.

Marco Aqil1,2,3, Gilles de Hollander4,5, Nina Vreugdenhil6,7,8

  • 1Spinoza Centre for Neuroimaging, Amsterdam, the Netherlands. m.aqil@spinozacentre.nl.

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Summary
This summary is machine-generated.

Psilocybin, a compound found in magic mushrooms, changes how we perceive context and affects brain activity. This study reveals that altered contextual computations may be a key mechanism behind psychedelic effects.

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Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Computational Psychiatry

Background:

  • Psilocybin is known to induce profound alterations in consciousness and perception.
  • Understanding the neural and computational mechanisms of psychedelic action is crucial.

Purpose of the Study:

  • To investigate the effects of psilocybin on contextual perception and cortical processing.
  • To develop a computational model explaining psilocybin-induced changes in visual perception and neural activity.

Main Methods:

  • Psychophysics to assess perceptual changes using the Ebbinghaus illusion.
  • Ultra-high field functional Magnetic Resonance Imaging (fMRI) to measure brain activity.
  • Computational modeling to link behavioral and neural findings.

Main Results:

  • Psilocybin significantly altered performance in the Ebbinghaus illusion, demonstrating changes in contextual perception.
  • Cortical responses to visual stimuli showed altered contextual modulation under psilocybin.
  • A computational model successfully captured and integrated the observed behavioral and neural effects.

Conclusions:

  • Altered contextual computations represent a potential general mechanism for psilocybin's effects.
  • This research provides a framework for understanding psychedelic action through the lens of predictive processing.
  • Vision serves as a model system to elucidate broader principles of psychedelic-induced cognitive and neural shifts.