There was an earlier article that made a couple of categories inside the "has internal voice" group. It went something something like: Can your internal voice

There was an earlier article that made a couple of categories inside the "has internal voice" group. It went something something like: Can your internal voice - raise its voice to sound louder - change its expression, sound happy, sad, angry - sing - do you hear conversations with multiple participants, with separate voices I recall the article said some people had "singular, monotone" internal voices that are more streams of words than actual voices, and others heard it as if it was an actual sound. It's all a spectrum.