I’ve never understood how they make people see things. Same thing with ayahuasca. Obviously, there’s some sort of chemical reaction within our brain like with any drug, but what about these makes us see things that aren’t there? Also, how does our brain create so many realistic images in front of us without them being real?
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The shortest answer is that basically all activities in the brain are chemical or electrical triggers, many of which our brains have evolved to interpret as input from the outside world. If a chemical disrupts that activity, it disrupts our perception of the outside world. It’s not entirely different conceptually from the way that alcohol disrupts how your brain interprets physical input, making you think you’re off balance when you’re not.
Psychedelics affect how the brain processes visual stimuli, which results in changes to visual perception. There are also a lot of changes to other psychological processes, that can i.pact how you perceive or think about those visual changes. There’s a lot going on there, and much of it is poorly understood because of (US) federal regulations that severely limit research due to how the drug is classified.
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