What Is It Like Not to Notice a Typo?
Most of us (certainly I!) can a dozen times read something we've written without noticing a typo. What, I wonder, is the phenomenology of that?
Suppose I've written a sentence with "that" where "than" should be. Maybe I've been reading Nichols on disgust, and I write "Drinking five glasses of saliva is worse that drinking one." What is it like for me to see that sentence as I read it? Do I see it at all (Hurlburt thinks maybe not)? Supposing I do visually experience the sentence, do I see the "that" as a "than", so that my visual experience, in the appropriate place, is actually "n"-ish rather than "t"-ish? Or is my visual experience really "t"-ish in that spot, though I fail to notice the error? Or is my visual experience somehow indefinite between "n" and "t" (and maybe some other shapes), even though I may be foveating (looking directly) on the "t"?
Suppose I'm also saying the sentence to myself in inner speech as I read it. Parallel questions arise. Do I utter to myself "than", "that", or some more indefinite thing?
Now my own hunch is that I see the "t" (or maybe something more indefinite) but utter the "n". At least it's hard to imagine that I would utter the "that" aloud without noticing the typo. But this is only a hunch, and I'm not a great believer in introspective hunches. Maybe in some future neuroscience, if we can narrow down more precisely the correlations between brain states and conscious experience, we could scan the visual system for a "t"-ish or "n"-ish representation in the right part of the visual system -- but that's a long way off, if ever we'll get there. Could more careful introspection get us the right answer? That's tricky, too -- not noticing something is necessarily an elusive sort of experience. It's hard to believe, though, that something as mundane and nearby as this would be beyond our ken....