system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 what actually happens in our brains while on psychedelics to cause 'tripping', hallucinations etc.

As per the title, what is the chemistry behind what psilocybin, lsd etc., does do our brains ?
gpt
We don't know. Other than that it binds to serotonin receptors and lights our brain up on an MRI like a Christmas tree. We haven't really done enough research on serotonergic hallucinogens to totally understand their effects on our brain chemistry.