I wonder if this may be related to anendophasia, the absence of an inner voice. Apparently it has an influence on self-reflection and verbal working memory.
I have aphantasia so anendophasia sounds like such a nightmare to me, though I imagine those so have it would likely feel the opposite of me. I've met some folks in the past who I'd suspect have anendophasia, but I'm not sure how I'd ever bring that up without coming across as uncouth.
Anyone with anendophasia care to opine on their experience?