So recently, I cam across a philosorapotor meme that said "What language to deaf people think in?". I set off to find out the answer.
My immediate thought was that since humans think in pictures, not words, they think in their own code for everything. To think is simply to compose an image in your mind, which answers the question.
Unless a deaf was photographic memory, because since they have never heard a certain word for anything, they can never remember the mental code they gave the item. For example, a deaf might call a Zebra "Giggle" one time, but the next time call it "jiggle". This lack of communication results in a drop in intelligence. A normal person would have someone telling them the name, but since they are deaf, they have no way of being reminded what they are.
Also, they would probably have problems with reading comprehension, since they have no one telling them what the words are pronounced as.
However, if a deaf were to have a photographic memory, then they would have a very advanced intelligence, since they were able to take the focus they would normally use for listening and be able to divert it to remembering everything.
TL;DR: Deaf people are either really dumb or really stupid.
