Reference code: | PT/FB/BL-2018-252.10 |
Location: | BF-GMS
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Title:
| Rapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields
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Publication year: | 2024
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URL:
| https://doi.org/10.1016/j.neuroimage.2024.120718
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Abstract/Results: | Abstract:
N, N-dimethyltryptamine (DMT) is a psychedelic tryptamine acting on 5-HT2A serotonin receptors, which is associated with intense visual hallucinatory phenomena and perceptual changes such as distortions in visual space. The neural underpinnings of these effects remain unknown. We hypothesised that changes in population receptive field (pRF) properties in the primary visual cortex (V1) might underlie visual perceptual experience. We tested this hypothesis using magnetic resonance imaging (MRI) in a within-subject design. We used a technique called pRF mapping, which measures neural population visual response properties and retinotopic maps in early visual areas. We show that in the presence of visual effects, as documented by the Hallucinogen
Rating Scale (HRS), the mean pRF sizes in V1 significantly increase in the peripheral visual field for active condition (inhaled DMT) compared to the control. Eye and head movement differences were absent across conditions. This evidence for short-term effects of DMT in pRF may explain perceptual distortions induced by psychedelics such as field blurring, tunnel vision (peripheral vision becoming blurred while central vision remains sharp) and the enlargement of nearby visual space, particularly at the visual locations surrounding the fovea. Our findings are also consistent with a mechanistic framework whereby gain control of ongoing and evoked activity in the visual cortex is controlled by activation of 5-HT2A receptors.
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Accessibility: | Document exists in file
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Language:
| eng
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Author:
| Pais, M. L.
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Secondary author(s):
| Teixeira, M., Soares, C., Lima, G., Rijo, P., Cabral, C., Castelo-Branco, M.
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Document type:
| Article
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Number of reproductions:
| 3
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Reference:
| Pais, M. L., Teixeira, M., Soares, C., Lima, G., Rijo, P., Cabral, C., & Castelo-Branco, M. (2024). Rapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields. NeuroImage, 297, 120718. https://doi.org/10.1016/j.neuroimage.2024.120718
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2-year Impact Factor: | 4.7|2023
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Impact factor notes: | Impact factor not available yet for 2024
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Times cited: | 1|2025-02-19
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Indexed document: | Yes
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Quartile: | Q1
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Keywords: | Serotonin / 5-HT2A receptors / Psychedelics / Visual hallucinations / Population responses / Visual cortex
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Rapid effects of tryptamine psychedelics on perceptual distortions and early visual cortical population receptive fields |