[kerng]

There have been books written about these topics 100s of years ago, so that's why it's pretty well known.

Some describe that there are two voices, first is the thinker, second the proofer. The thinker thinks, the proofer proofs. But that's a very specific description.

What might be the difference is that some physically articulate and form words, whereas others keep it to their minds and thoughts, and many try to silence it entirely.

The book Siddhartha also gives this an interesting spin, although that's a novel.