system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come our brain can create auditory and visual hallucinations from schizophrenia for example, but we cannot do it willingly?
gpt
We associate only parts of our brain with "doing things willingly". For example, we cannot (generally) willingly feel less or more anxiety, hunger, desire, and so on. Similarly, we cannot (generally) willingly experience blackouts, goosebumps, hallucinations, and so on. 

In short, we are much more than a concious being, and we exist in/as a body with all kinds of functions that we have (generally) no conscious control over.