Neural Network Modulation of Ayahuasca: A Systematic Review of Human Studies
Psychoactives – March 20, 2023
Source: OpenAlex
Summary
Ayahuasca, a serotonergic hallucinogen, has been shown to significantly alter brain connectivity. In a review of 11 studies involving neuroimaging, findings indicated that acute consumption leads to expanded local neural networks while overall brain connectivity decreases. Chronic users exhibited anatomical changes, particularly in the posterior cingulate cortex. Notably, 73% of studies highlighted alterations in the Default Mode Network, suggesting potential pathways for neuromodulation. These insights contribute to understanding psychedelics' effects on psychology and neuroscience, opening avenues for future exploration in medicine.
Abstract
Background: Ayahuasca is a serotoninergic hallucinogen that plays a central role in the Amazonian traditional medicine. Its psychoactive effects are associated with the presence of N,N-dimethyltryptamine (DMT), and monoamine oxidase inhibitors (MAO-A). Advances in neuroimaging investigations have provided insight into ayahuasca’s neurobiological mechanisms of action. Methods: Selecting only studies with neuroimaging results related to human ayahuasca consumption, we included six articles from a previous systematic review of serotoninergic hallucinogen neuroimaging studies up to 2016. Furthermore, we updated the data with a new systematic search from 2016 to 2022. We searched the PubMed, SciELO, and LILACS databases using the search terms “(ayahuasca OR DMT) AND (MRI OR fMRI OR PET OR SPECT OR imaging OR neuroimaging)”. Results: Our updated search provided five new articles for a total of 11 included in this review. The results on the Default Mode Network (DMN) are evident and may indicate a path to short term neuromodulation. Acutely, local neural networks appeared to become expanded, while overall brain connectivity declined. On chronic consumers, anatomical changes were reported, most notably related to cingulate cortex. Conclusion: Ayahuasca seems to change acute brain connectivity similarly to other psychedelics. The results are preliminary and further studies are warranted.