This topic (comments here, the OP, and comments in threads elsewhere) exposes some conflicting definitions of what an "internal monologue" is or means. - Some people describe hearing their internal monologue, which I take to mean something like: they have an internal monologue, and it manifests as a voice that only they hear. These people are analogous to those who see things they picture in their mind's eye . - Some…
It reminds me of a conversation I had with my sister as a child. We were both falling asleep in a very dark room. I noticed that with my eyes open, staring into darkness, there was a kind of static noise pattern overlaying my vision. I asked her if she had the same thing. "No", she said. "I just see black". Thinking back, it's likely that we were both experiencing the same thing, but she just wasn't observing the same things that I was.