Based on the vocaloid "Alice of Human Sacrifice"
The human often considers itself alive. But what is truly alive? Is it the heart? Is it our brain? No what is truly alive is the idea. It survives through communication; reproducing, growing, changing. What is the brain you ask, it is the thing that creates,incorporates, and hear these ideas. When you think of yourself, do you think of how you look? Your body might wither away but the idea of you will live forever. What if you come up with an idea or melody and die before you actually tell someone about it. Will the idea suddenly disappear? No it just waits until someone hears it again.
Maybe schizophrenic people just hear those ideas better then others