how do non drug induced Visual Hallucinations work ? what happens in the brain that makes the eyes see something that isn’t there?

Question

how do non drug induced Visual Hallucinations work ? what happens in the brain that makes the eyes see something that isn’t there?

In: 598

Answer 1

Oliver Sacks wrote a [great book](https://bookshop.org/p/books/hallucinations-oliver-sacks/9799237?ean=9780307947437) entitled *Hallucinations* which is just about this phenomenon.