When something becomes "second nature" like writing, it is impossible to know exactly what your brain is doing to do it, because it is doing it automatically without you being consciously aware. (I think that is what some other comments mean in calling it "muscle memory".)
So asking people this is not going to get you reliable answers, it is going to tell you what people think their unconscious brain is doing.
However the word you just wrote is right there in front of you, and you know mentally what word you just wrote, so seeing or knowing that there are t's and i's that need completing, seems pretty much a no brainer. Of course this is the sort of observation we use to make up answers about what our brain must be doing...
I'd be interested to know how often people miss their dots and crosses.
Thanks for the heads up! I have a couple of things where I just ignored the WiFi casually thinking it didn't matter because I wasn't going to connect, but shit I never considered the security liability... (Or are they bluetooth?...time to assess...)