 On the other hand, you can have evidence you don’t notice you have, and this point might favor the Attention Optional view. Consider everyday cases of “change blindness” discussed by Dretske 2004. For example, your friend gets a haircut, and asks you “do I look different?” You are stumped. On Dretske’s account, you might still have a perfectly accurately experience of how his hair now looks. Here your experience plausibly gives you justification to believe that your friend got a haircut (when combined with your background beliefs). You also fail to notice that your experience gives you justification to believe your friend got a haircut. If experiences provide un-noticed evidence, such cases are arguably good precedents for the sorts of cases allowed by the Attention Optional view. (For striking cases of change blindness, see the link in  Other Internet Resources.)