system
Given the following post, respond as if you're commenting on Reddit:
human
In a biological way, how are hallucinations really created?

With all the light on the retina and everything, it's like the inverse process- the brain sends message to the eyes to create something that isnt there. How does that happen?
gpt
Normally the eyes send signals to the brain to interpret. When you see hallucinations, your brain is either creating signals spontaneously which it tries to interpret, or your brain interprets real signals wrong.