So my Dad got a chochlear implant and had it turned on a few weeks ago. Apparently, what you perceive with an implant like this doesn't feel like sound at first, you have to train in order to process the output of it as hearing. Dad described the sound of the turn signal in the car (he hadn't heard it in years) as something he couldn't figure out. He said it wasn't that he couldn't logically figure out the noise a turn signal made, it was that his brain had a hard time locking on to the sensation as being a sound at all.
It freaks me out we're to this point, but Elon is doing this with eyes rn, so I guess technology isn't going to stop.