How do psychedelics affect the brain that people experience insane things so quickly or intensely?

Question

How do psychedelics affect the brain that people experience insane things so quickly or intensely?

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Answer 1

They screw up the things which your brain uses to interpret reality. Everything we sense is converted into electrical signals in our brain, which puts the pieces together to make something coherent. But if you get something in there that disrupts this process, those electrical signals change.

And since reality is interpreted based on those signals, the altered signals make you experience sensory information in the exact same way you would if what you were experiencing was actually real.