In fact, this internal monologue can be used in psychology when you are dealing with bad experiences by dividing your thoughts into an entity who suffers the pain and another one who is logical and supportive. For example, acting towards yourself the same way you would do for a friend.
1) experience the words as if I'm saying them out loud but don't vocalize them. This is similar to how a lot of people read, so I figure I'm technically subvocalizing them.
2) especially when doing math or programming I simply know what I was about to think using method 1) without any specific words springing up.
I can't figure out if method 1 is me having an auditory internal monologue or if it's non-auditory. But at least you have a second experience to contextualize with.
EDIT: I would also like to add that sometimes when programming my mind switches to a graph-like representation that I start to manipulate physically. That is, I'll actually move my fingers in the air and move around the idea of this graph to "view" it from different perspectives and at different levels "Minority Report"-stye. Yes, that is something I try not to do anywhere but at home.
Yes. I can also do this:
> decide to eat a bagel without experiences any words.
...but I prefer to think consciously about my actions. Doing too many things without internally verbalizing the decision-making process makes me feel like a beetle.
My personal experience (in the non-audible group) is that the "role" this voice is playing is a bit more supervisory/executive. It thinks about what I need to do tomorrow, or the next three steps on my current project, or that I really need to carve out time to go to the cleaners some morning.
This voice might think about getting food, but mostly when hunger is getting in the way of other priorities. Or when I need to game out how to fit food into a tight schedule.
Yes this is how it is for me. I can eat the bagel without consulting him, but he speaks out the words of this post that I'm writing or any email/report. When I'm on autopilot like driving or playing a game/sport I don't hear him. But if I want to think about plotting a different route or a changing in strategy, the voice will talk me through it.