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

Under the effects of LSD, different parts of your brain gain access to communicate with your visual cortex, allowing your usually unconscious mental content to manifest itself in your conscious visual experience.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4855588/

“Importantly, a very strong relationship was also observed between increased V1 RSFC and decreased alpha power in occipital sensors, suggesting that as well as being commonly related to visual hallucinations, these physiological effects are closely interrelated. The increase in V1 RSFC under LSD is a particularly novel and striking finding and suggests that a far greater proportion of the brain contributes to visual processing in the LSD state than under normal conditions. This expansion of V1 RSFC may explain how normally discreet psychological functions (e.g., emotion, cognition, and indeed the other primary senses) can more readily “color” visual experience in the psychedelic state.”