Could you expand on this, please? I'm not sure I'm familiar with the failure mode you seem to be pattern-matching to.
The point is that when someone "hears voices" - which do not respond to the will in the same way in which internal monologues do, there's no demons, there's no new brain added. It is existing brain regions involved in the internal monologue failing to integrate properly with the rest. Less dramatically, when people claim they e.g. want to get on a diet but are mysteriously unable to - their actions do not respond to what they think is their will but instead respond to what they think is not their will - it's the regions which make decisions about...
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.