Acute effects of psilocybin on the dynamics of gaze fixations during visual aesthetic perception
OpenAlex – November 01, 2023
Source: OpenAlex
Summary
High doses of psilocybin dramatically alter visual perception, redirecting gaze. Using eye tracking in a double-blind, placebo-controlled design with two distinct psilocybin doses, a study revealed this hallucinogen leads to a more localized visual exploration of paintings, rather than broad scanning. This shift in eye movement and fixation suggests a profound impact on consciousness and cognitive psychology, mediated by altered perception of low-level visual information like textures. Participants reported heightened emotional responses, underscoring psilocybin's effect on how we experience visual stimuli. Neuroscience continues to explore these psychedelic insights.
Abstract
Abstract Rationale Serotonergic psychedelics are remarkable for their capacity to induce variable yet reproducible modifications to human consciousness The most salient acute effects of these compounds include perceptual alterations, predominantly in the visual domain, yet to date these alterations have been mostly documented only by subjective reports. Objectives We used eye-tracking to quantify the effects of low vs. high doses of psilocybin mushrooms on the eye movements that underlie the exploration of complex visual stimuli, focusing on the particular case of aesthetic perception. Results Following a double-blind placebo-controlled design under semi-naturalistic conditions, we demonstrated that high doses of psilocybin result in a more local visual exploration of paintings, and thus in a less entropic fixation probability distribution. Participants reported heightened emotional response and state of flow under the high dose condition. Conclusions These findings are consistent with an effect of psilocybin on gaze fixation mediated by altered perception of low-level visual information, such as textures, shapes and colors. Our work also highlights the possibility of investigating psychedelics by addressing their effect on behavior under complex naturalistic conditions, which contributes to maintaining subject engagement while also increasing the ecological validity of the findings.