I don't think the out loud or someone listening / reacting matters at all here. Suspect it's entirely this: >The thought that was comfortable as a vague impression has to become a sentence, and sentences have structure. It's not unlike what people like PG say about writing improving thinking...it's the being forced to go from fuzzy directional notions to something you can put on paper in that will stand up to critiqu…
I don't think the out loud or someone listening / reacting matters at all here. Suspect it's entirely this: >The thought that was comfortable as a vague impression has to become a sentence, and sentences have structure. I often construct full sentences in my head. And have conversations with my mental model of some other person. In full sentences
I've only ever heard that associated with schizophrenia, but I don't even know if that's true or not.