🧠✨ For a Different Kind of Trip Advisor…
When your brain turns down reality and turns up memory
Sometimes, the brain doesn’t see the world. It remembers it into existence.
According to a new study, psychedelics don’t just add colors to reality—they rebalance the whole perception engine. They dial down incoming visual signals and crank up the volume on memory. The result? Hallucinations that are less “random fireworks” and more your past leaking into your present.
“Visual information about things happening in the outside world becomes less accessible to our consciousness. To fill this gap in the puzzle, our brain inserts fragments from memory – it hallucinates,” explains Callum White, the study’s first author.
The culprit (or hero, depending on your weekend plans) is the serotonin 5-HT2A receptor, a favorite docking station for psychedelic compounds. When this receptor is activated, activity in visual brain regions drops. The brain, being the world’s most stubborn storyteller, refuses to leave the stage empty—so it starts improvising from memory.
And it gets even cooler (or weirder).
Under psychedelics, the brain starts producing stronger slow brain waves—around 5 Hz—in visual areas. These slow rhythms boost communication with the retrosplenial cortex, a key hub for accessing stored memories. As Professor Dirk Jancke puts it, the resulting state feels “a bit like partial dreaming.” Less here-and-now. More there-and-then.
To watch this happen live, researchers used genetically modified mice whose brain cells glow when active—basically turning the cortex into a real-time neural light show. This let them track signals in pyramidal cells, the brain’s long-distance messengers, and see perception literally shift from world-driven to memory-driven.
Why does this matter beyond mind-bending visuals?
Because the same mechanism might explain why psychedelic-assisted therapy shows promise for depression and anxiety. If you can temporarily loosen the grip of negative, overlearned thought patterns—and selectively recall different, more positive memories—you might be able to, as Jancke says, “unlearn negative context” and rewrite parts of the mental script.
In other words:
Psychedelics don’t just make you see things.
They make your memory start seeing for you.
Reality turns down the volume.
The archive turns it up.
And for a while, the brain becomes its own… trip advisor.
Enjoy the voyage. Carpe Diem.
Source:
White, C.M., Azimi, Z., Staadt, R. et al. Psychedelic 5-HT2A agonist increases spontaneous and evoked 5-Hz oscillations in visual and retrosplenial cortex. Commun Biol 9, 216 (2026). https://doi.org/10.1038/s42003-025-09492-9
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DOI https://doi.org/10.1038/s42003-025-09492-9