June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Psilocybin slows binocular rivalry switching through serotonin modulation
Author Affiliations
  • Olivia Carter
    Vision Sciences Lab, Harvard University, and Vision Touch & Hearing Research Centre, University of Queensland, and Neuropsychopharmacology and Brain Imaging, University of Zurich Psychiatric Hospital
  • Jack Pettigrew
    Vision Touch & Hearing Research Centre, University of Queensland
  • Felix Hasler
    Neuropsychopharmacology and Brain Imaging, University of Zurich Psychiatric Hospital
  • Guy Wallis
    Perception and Motor Systems Lab, University of Queensland
  • Franz Vollenweider
    Neuropsychopharmacology and Brain Imaging, University of Zurich Psychiatric Hospital
Journal of Vision June 2006, Vol.6, 43. doi:10.1167/6.6.43
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      Olivia Carter, Jack Pettigrew, Felix Hasler, Guy Wallis, Franz Vollenweider; Psilocybin slows binocular rivalry switching through serotonin modulation. Journal of Vision 2006;6(6):43. doi: 10.1167/6.6.43.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Binocular rivalry refers to the fluctuations in visual awareness/suppression that occur when different images are simultaneously presented to each eye. To explore the role of serotonin (5-HT) in binocular rivalry, this study investigated the affects of the hallucinogenic 5-HT1A&2A receptor agonist psilocybin (the active compound in “magic mushrooms”), alone and after pretreatment with the selective 5-HT2A antagonist ketanserin in ten healthy human subjects. Psilocybin significantly reduced the rate of binocular rivalry switching and increased the proportion of transitional/mixed percept experience. Ketanserin pretreatment blocked the majority of psilocybin's “positive” psychosis-like hallucinogenic symptoms, but had no influence on the psilocybin induced slowing of binocular rivalry switching or the “negative” symptoms associated with reduced arousal and vigilance. This finding directly links binocular rivalry switching rate to arousal and attention and suggests that psilocybin induced slowing of binocular rivalry is not 5-HT2A mediated, but instead may reflect a 5-HT1A mediated reduction of serotonin release from the brainstem raphe nuclei.

Carter, O. Pettigrew, J. Hasler, F. Wallis, G. Vollenweider, F. (2006). Psilocybin slows binocular rivalry switching through serotonin modulation [Abstract]. Journal of Vision, 6(6):43, 43a, http://journalofvision.org/6/6/43/, doi:10.1167/6.6.43. [CrossRef]
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