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Psilocybin-induced modulation of visual salience processing.

Stephanie Muller1,2, Federico Cavanna1,2, Laura Alethia de la Fuente1,2,3

  • 1National Scientific and Technical Research Council (CONICET), Godoy Cruz 2290, C1425 Cdad. Autónoma de Buenos Aires, Argentina.

Neuroscience of Consciousness
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Summary
This summary is machine-generated.

Psilocybin, a psychedelic compound, alters visual attention during natural scene perception. High doses increase focus on salient areas and lead to more exploratory eye movements, impacting how we process visual information.

Keywords:
attentioneye trackingperceptionpsilocybinsalience

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Area of Science:

  • Neuroscience
  • Psychopharmacology
  • Cognitive Science

Background:

  • Psychedelic compounds like psilocybin profoundly alter conscious perception.
  • The effects of these alterations on complex visual-guided behaviors are not well understood.
  • Investigating psilocybin's impact on visual salience processing is crucial for understanding its cognitive effects.

Purpose of the Study:

  • To investigate how psilocybin modulates visual salience processing during natural scene perception.
  • To analyze gaze patterns in relation to computational saliency maps.
  • To explore the neural correlates of these perceptual changes.

Main Methods:

  • Twenty-three participants underwent eye-tracking tasks with self-blinded low and high doses of psilocybin.
  • Naturalistic design with unknown experimental conditions for participants and researchers.
  • Gaze patterns analyzed against deep learning-based computational saliency maps; resting-state EEG recorded.

Main Results:

  • High-dose psilocybin increased fixation on salient image regions and reduced inter-fixation distance.
  • Visual scanning became more exploratory and less predictable, indicated by Shannon entropy.
  • EEG showed reduced broadband spectral power and increased Lempel-Ziv complexity; delta power correlated negatively with salience metrics.

Conclusions:

  • Psilocybin significantly alters attentional dynamics and visual salience processing.
  • It induces heightened sensitivity to visual salience and more localized, yet exploratory, gaze behavior.
  • Findings suggest a neurobiological basis for psilocybin's effects on visual perception and attention.