system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: When I'm watching a movie or television programme, why does my brain feel the need to read subtitles even if they're in the same language as the characters are speaking?
gpt
When you were young, you learned to read. And learned. And learned. And learned. When you were learning history, math, science, etc, you were really also practicing reading. You read cereal boxes, street signs, just endless practice.

You're so good at it now that you can't not read. You literally cannot "turn off" reading. It is so automatic and fast that as soon as you look in the direction of some written text, you've read it before you can do anything else.

You should look up the Stroop Effect because it shows, among other things, that you process words faster than colors and faster than your ability to make decisions about what to process and what not to process. 

This is not a natural human condition necessarily, and little kids can still "turn it off" when they're just learning to read.