New neuroscience reported by ScienceDaily suggests psychedelics may produce hallucinations by reducing real-time visual input and increasing memory-driven perception. Psychedelic compounds act strongly at the serotonin 5-HT2A receptor, which can dampen activity in brain regions that process incoming visual information. When external signals are turned down, the brain appears to “fill in” experience with internally stored material—like memory fragments. Researchers observed increased slow rhythmic activity (~5 Hz) in visual areas, which they interpret as a shift toward internal processing. They also found stronger coupling with the retrosplenial cortex, a region involved in memory access and internal navigation. To study this, the team used optical imaging in specially engineered mice whose neurons fluoresce during activity. The authors describe the resulting state as “a bit like partial dreaming,” with perception guided more by internal recall than outside reality. Clinically, this model helps explain why psychedelic experiences can feel personal and emotionally loaded. For psychotherapy, it supports the idea that psychedelic-assisted work may temporarily open a “memory-forward” window that can be used for insight and re-learning when paired with preparation and integration.
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