I suppose this might be able to explain why I've seen a lot of younger computer users seem to have no problems at all reading webpages full of flashing, moving ads or just animated GIFs in general, that I would have to physically block out in order to even focus on the text. However I've also noticed that a lot of these users are not as attentive to the details of the text they're reading, skipping entire words and even sentences. Maybe they are being distracted, but don't notice that they are.