To directly answer your question. I think that when someone is deaf, they have the visual input of lipreading and use that as a visual aid for language, much like a blind person has braille for reading. When you add sound to the lip movements, they know what they are saying. I’ll give an example. I’m profoundly deaf and I wear a hearing aid. If i were to watch a TV show, but use subtitles, when i read the words, i can “hear” those words very clear. If I looked away from the subs, the words become garbled immediately, I might catch a few words but mostly not. When I return to reading the subs, it becomes clear again. I think those with CI’s use a mix of lipreading from a very young age and the sound and that helps them to know what is being said in their own language.
I hope that makes sense.
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