Not exactly what you're asking, but I think of The Exorcist as a partially cancelled book (and it pisses me off, lol). William Blatty admitted he had to rush into the end because they were pressuring him to publish and that's why it felt WAY TOO out of place with the rest of the book. And it's such a shame, honestly, I would have loved to read the original idea for the exorcism and the ending

There are two types of thought patterns: verbal and visual.

The majority of people have verbal thoughts, like you say, they hear what they're thinking/reading. Some other people, however, have visual thoughts: they see forms and structures of sentences or objects.

This is, of course, predominantly. We don't have verbal thoughts all of the time and the visual-thinkers don't lack internal monologue, though they struggle a bit to get there.

The thing is: you can't choose. You get what you get. If you're a verbal-thinker, then that's what you'll ever be. You can totally train to read faster, though. There are plenty of tips for that

Interpretation is a multi-faceted topic, because some of it are just so abstract and extremely symbolic that they could only belong to the reader. But when the interpretation follows a methodical and systematic analysis thorough the book (or all of the books from an author), it could be attributed to the writer even if it wasn't consciously intended.