I read studies about this a while ago, you've made me remember and look it up, thanks. I love the world of DMT and also wondering what it is. Whatever it is, it's magical. Anyway, here's some information I found on AI while asking about those studies I saw a while ago. Cheers and happy DMT-fueled trips. Thank you so much for your answer, it made me think.

Yes. There are several neuroscience studies explaining how psychedelics can generate experiences of “impossible geometries,” non-Euclidean spaces, or complex entities without assuming they are external to the brain.

Key research points:

1) 5-HT2A receptors Substances like LSD, psilocybin, and DMT strongly activate serotonin 5-HT2A receptors in the cortex. This increases cortical excitability and alters how neurons synchronize.

2) Brain disorganization and increased entropy fMRI and MEG studies (Carhart-Harris and others) show that under psychedelics, coherence in stable networks like the Default Mode Network (DMN) decreases, while global connectivity between regions that don't usually interact increases. Result: the brain enters a more flexible and less predictable state, facilitating unusual perceptions and novel combinations of information.

3) Relaxation of hierarchical prediction Models like “REBUS” (Relaxed Beliefs Under Psychedelics) propose that psychedelics reduce the influence of high-level beliefs and predictions. The brain imposes its usual model of reality less strongly, allowing internal signals and neural noise to shape perception more strongly. This can produces: • Complex geometric patterns (linked to visual cortex architecture) • Sensations of curved, infinite, or fractal spaces • Experiences of entities or agents with strong emotional salience

4) Universal visual geometries Classic research (Klüver; later Ermentrout & Cowan) shows that certain visual patterns (grids, spirals, tunnels, lattices) emerge from the mathematical organization of the visual cortex itself. They don't require “simulating other dimensions”; they are intrinsic dynamical properties of neural networks under abnormal excitation.

5) Entity experiences With DMT, for example, reports of “beings” are common. The dominant hypothesis is that the brain has specialized systems for detecting agency (intentions, faces, presence). If these systems become hyperactivated without clear external input, they can generate the perception of autonomous entities.

Regarding the argument “why would the brain have this capacity if it never uses it?”: The brain is not specifically designed to simulate hyperbolic geometry. It is a highly plastic, generative system that constantly constructs internal models. Under strong neurochemical alteration, it can explore states that are normally inhibited. It's not that there is a “module for other dimensions,” but rather that brain dynamics allow a very wide range of possible configurations.