How do some people think/speak inside their head while others can’t?

Question

How do some people think/speak inside their head while others can’t?

In: Biology

Answer 1

Is having or nor having internal monologue the norm? I thought everyone had it.

I also thought having verbal dialogue in dreams was normal. Next you’ll tell me most people don’t assign unique voices and accents to the comments they read in forums or characters in books.

FYI, 90% of redditors have a 18th century British Accent.