Effects of the Amazonian Psychoactive Beverage Ayahuasca on Binocular Rivalry: Interhemispheric Switching or Interhemispheric Fusion?
Abstract
An early theoretical analysis supposed changes in hemispheric integration as the basis of altered state of consciousness induced by psychoactive drugs. Brain imaging studies revealed right cortical activation after administration of hallucinogens. Recent studies on binocular rivalry suggest that interhemispheric switching is the neural substrate of the perceptual oscillations observed during dichoptic stimulus presentation. The current study tested perceptual alternation in ceremonial participants, who ingested the South American hallucinogenic beverage ayahuasca, to examine the claim that there might be changes in interhemispheric function under the influence of hallucinogens. Ingestion of ayahuasca resulted in a decrease of rivalry alternation rates, increased length of one percept and there was evidence of phenomenal fusion. The findings are in line with results of brain activation studies and support the concept of interhemispheric fusion in altered states of consciousness.
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Ayahuasca influences hemispheric dominance, as concluded from analysis of binocular rivalry under the brew.
“By analyzing the binocular rivalry under the effect of the brew, conclusions were drawn that ayahuasca influences hemispheric dominance (Frecska et al., 2003) and gamma oscillations (Frecska et al., 2004).”
From The therapeutic potentials of Ayahuasca: possible effects against various diseases of civilization (2016) · cites this paper as Frecska et al., 2003
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References 46 · Cited by 12
- Authors
- Frecska, E., White, K. D., & Luna, L. E.
- Affiliations
- University of Florida (US)
- Venue
- Journal of Psychoactive Drugs
- Publisher
- Informa UK Limited
- Published
- 2003-09
- Volume
- 35
- Issue
- 3
- Pages
- 367-374
- ISSN
- 0279-1072 (ISSN-L)
- 2159-9777
- OpenAlex
- W2045194309
- Cited by
- 12
- References
- 46
- Citations by year
- 2024: 1 · 2023: 1 · 2022: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2013: 1 · 2012: 1
- FWCI
- 0.41
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Psychoactive Drugs (publishedVersion)
- PubMed (publishedVersion)
- University of Debrecen Electronic Archive (University of Debrecen) (submittedVersion)
- Topics
- Social Sciences › Psychology › Clinical Psychology › Psychedelics and Drug Studies
- Life Sciences › Neuroscience › Cognitive Neuroscience › Hallucinations in medical conditions
- Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
- Keywords
- ayahuasca, binocular rivalry, altered states of consciousness, hallucinogens, perceptual alternation, hemispheric integration
- MeSH terms
- Adult, Aged, Beverages, Dominance, Cerebral, Female, Hallucinogens, Harmine, Humans, Male, Middle Aged, Visual Perception, Vision, Binocular, Dominance, Ocular, Plant Preparations, Banisteriopsis
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