One of the most under-studied aspects of human cognition is variance in "internal monologues."
Minds are not just machines made of simple parts that are shipped in via anatomy and turned on, they are individually generated from experience and cellular interaction.
This is perhaps most easily seen in research looking at the vast differences in how people think. Some have voices that never stop, others think holistically and avoid sentence-style extrusion. https://www.sciencealert.com/we-used-to-think-everybody-heard-a-voice-inside-their-heads-but-we-were-wrong

We Used to Think Everybody Heard a Voice Inside Their Heads – But We Were Wrong
Only in recent years have scientists found that not everyone has the sense of an inner voice – and a new study sheds some light on how living without an internal monologue affects how language is processed in the brain.



