system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: what causes halucinations in your brain when you take LSD and how do they differ from hallucinations that someone with schizophrenia would have?
gpt
Technically what you see when you take LSD isn't a hallucination, it's a pseudohallucination. The difference is that people on LSD recognize that what they're seeing isn't real, but people with schizophrenia don't. 

The visual effects of LSD have to do with it interacting with serotonin receptors that control vision. The mechanism isn't well understood.