how do non drug induced Visual Hallucinations work ? what happens in the brain that makes the eyes see something that isn’t there?
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The top answer is great, just wanted to add that we all see things that aren’t there every night, in our dreams. The images in our dreams play out through our visual cortex as if our eyes were open. Even beyond vision, our brains generally don’t make much distinction between imagining doing something and actually doing it. This is why studies have found that visualizing exercising an immobilized injured limb helps prevent muscle atrophy during healing. I highly recommend the book The Body Has a Mind of Its Own by Matthew and Sandra Blakeslee, full of fascinating science about the link between the mind and the body, but written in a totally accessible way.
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