I have this "condition". I didn't know it was unusual. I was on propecia (hairloss) medication for awhile, and it took the internal monologue away. I'm now off of it because life was dull and lonely without an active imagination. How curious that testosterone derivative hormones could alter brain activity.
I don't talk to myself in my head, except rarely (usually if I'm scolding myself, or trying to do an accent), but I think you'd be entirely wrong to describe me as not having an active imagination.
