system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What will happen to us if that voice inside our head will disappear?
gpt
You'd be surprised to learn that there are people who never got a voice in their head.  
They were the deaf people. For a long time people thought the best way to educate them was to teach them only to read lips and words. The results were pretty bad, that voice in your head is acting as scaffolding for alot of your thoughts, you can use that voice to store and manipulate information. For example you might review a sentence in your head before sending it to your fingers to type it out.  
So for the longest time people thought that deafness caused mental disabilities.  
  
Fortunately for the deaf, sign language is enough of a language to act as the voice in the head. Instead of "hearing" words in their heads, they "see" hand signs in their head. Now-a-day's they are taught sign language from a young age and their mental outcomes have improved.