it's not an outside voice telling you to do something, it's just forming thoughts as word to go alongside images and emotions. If you do a lot of reading and writing you will start to do it more. Everybody does it a bit, and everybody also sometimes thinks intuitively and quickly off of images and emotions only. The whole idea of two "categories" of people is almost always bunk (introvert-extrovert psuedoscience for example, there aren't 2 species of humans who 'gain energy' in opposite ways. There's just people who have a more developed set of social 'muscles' where they are not as overwhelmed by social interaction)