system
A chat on subreddit /r/me_irl
human
Yes but some people are just processing the meaning of the words, building understanding of the story and some people are actually “vocalising” the words or dialogue as they go along… like an audio book performed by them, in their head. 

It’s really trippy to think about isn’t it. All the things our brains do every day are so easy to take for granted and are really, weirdly complicated when you try to break them down.
gpt
Reading a book to me is like I'm watching a movie inside my head. 

The first time I realized this doesn't happen to everyone was when my husband explained to me why he doesn't like to read for entertainment.