Transient destabilization of whole brain dynamics induced by N,N-Dimethyltryptamine (DMT).
Communications biology – March 11, 2025
Source: PubMed
Summary
DMT, a powerful psychedelic, temporarily disrupts normal brain function by creating a state of heightened sensitivity in key brain regions. Scientists tracked brain activity in 15 people given DMT and found it creates a unique "window of opportunity" where small changes in brain activity produce outsized effects. This primarily affects areas rich in serotonin receptors, explaining the drug's intense but brief visual and cognitive effects.
Abstract
The transition towards the brain state induced by psychedelic drugs is frequently neglected in favor of a static description of their acute effects. We use a time-dependent whole-brain model to reproduce large-scale brain dynamics measured with fMRI from 15 volunteers under 20 mg intravenous N,N-Dimethyltryptamine (DMT), a short-acting psychedelic. To capture its transient effects, we parametrize the proximity to a global bifurcation using a pharmacokinetic equation. Simulated perturbations reveal a transient of heightened reactivity concentrated in fronto-parietal regions and visual cortices, correlated with serotonin 5HT2a receptor density, the primary target of psychedelics. These advances suggest a mechanism to explain key features of the psychedelic state and also predicts that the temporal evolution of these features aligns with pharmacokinetics. Our results contribute to understanding how psychedelics introduce a transient where minimal perturbations can achieve a maximal effect, shedding light on how short psychedelic episodes may extend an overarching influence over time.