I feel like I'm somewhat separated from my inner dialog. Meaning I can use it as entertainment, learning, get advice etc. It goes constantly, so if bored, i will listen to the inner dialog. I presume what goes on is 'me' is one brain half, spying on what the other is thinking/speaking about. Maybe this switches, so later I am the other half, listening in on the previous me. This makes sense to me, since both half's have their own consciousness(if not mistaken, this is proven).
If I couldn't hear myself, one brain half should be dead, and I presume I would lose the ability to self reflect.
The ears are in this context only for input, and mouth for output.
Visual modes will also occur, then, 'the voice' may shut up(focus). And not even input is registered. That seems again to be a different mode, a third and fourth consciousness? Sometimes all of this can be overactive. Sometimes the other brain half is more or less watching a movie. And what I think is cool with this, Is that this 'other' is smarter(but certainly not always, impulse control is of the essence, and always double check with the other<-sticky). So what I hear, is not something the brain half that I am on could have come up with. And I'm like, wow, really? Normally I can keep all of this undetectable from my surroundings, but emotional internal reactions can be challenging, especially if good humor is in play.
---
Bottom line. It appears to be a self substantiating process. If I could no longer hear myself. My needs for entertainment, learning, all types of input, would multiply. I would need more. Or the the brain would rot. Or become a robot(todays technology).