Effects of ayahuasca on the human EEG.
Abstract
EEG data were recorded under field conditions from 11 members of the Santo Daime Doctrine, a Brazilian shamanistic religion, before and after ingesting the psychoactive alkaloid preparation, ayahuasca, or daime, as they term it. Post-ingestion, we observed increases in power in the 36-44 Hz frequency band ("40 Hz") from the left occipital-temporal-parietal scalp electrodes in the eyes-closed condition, which extended to most of the posterior scalp in the eyes-open condition. The results are consistent with many reports that ayahuasca intensifies visual imagery. These results are discussed in terms of a thalamocortical model of the role of 40 Hz activity in brain function and conscious experience. We also noted tendencies toward decreases in the power of slow (theta and alpha) brain rhythms, and increases in the 14-30 Hz beta band, in accord with studies reported 30 years ago with other consciousness-altering compounds. Analysis of four ayahuasca samples yielded an average composition per ingested dose (75 ml) of 55.6 mg harmine, 43.9 mg tetrahydroharmine, 41.3 mg N,N-dimethyltryptamine (DMT), 4.6 mg harmaline, and 3.1 mg harmol. The DMT appeared to be of sufficient concentration to promote psychoactive effects, while the β-carbolines functioned to supply MAO inhibitors necessary to prevent degradation of DMT and to maintain its oral activity.
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Don et al. (1998) found significant power increase in the slow gamma (36-44 Hz) band at left occipito-temporo-parietal electrodes, with tendencies to power decreases in theta and delta bands after ayahuasca intake.
“Results indicated significant power increase in the slow gamma (36–44 Hz) band at left occipito-temporo-parietal electrodes, with tendencies to power decreases in theta and delta bands (Don et al., 1998).”
From The therapeutic potentials of Ayahuasca: possible effects against various diseases of civilization (2016) · cites this paper as Don et al., 1998
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- Authors
- Don, N. S., McDonough, B. E., Moura, G., Warren, C. A., Kawanishi, K., Tomita, H., Tachibana, Y., Böhlke, M., & Farnsworth, N. R.
- Affiliations
- University of Illinois Chicago (US)
- Kobe Pharmaceutical University (JP)
- Corresponding author
- Don, N.S.
- Venue
- Phytomedicine
- Publisher
- Elsevier BV
- Published
- 1998-04
- Volume
- 5
- Issue
- 2
- Pages
- 87-96
- ISSN
- 0944-7113 (ISSN-L)
- OpenAlex
- W2092016283
- Cited by
- 32
- References
- 30
- Citations by year
- 2025: 2 · 2024: 3 · 2023: 3 · 2022: 1 · 2021: 4 · 2020: 2 · 2019: 1 · 2018: 1 · 2017: 2 · 2016: 2 · 2015: 3 · 2012: 2
- FWCI
- 1.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Phytomedicine (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Social Sciences › Psychology › Clinical Psychology › Psychedelics and Drug Studies
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Alkaloids: synthesis and pharmacology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Synthesis and bioactivity of alkaloids
- Keywords
- ayahuasca, Santo Daime, EEG, 40 Hz oscillations, thalamocortical model, consciousness, visual imagery, harmine, tetrahydroharmine, N,N-dimethyltryptamine, β-carbolines, monoamine oxidase inhibitors, neural oscillations, psychedelic effects
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