Her conclusion: readers tend to skim on screens, distraction is inevitable and comprehension suffers. Researchers say readers remember the location of information simply by page and text layout — that, say, the key piece of dialogue was on that page early in the book with that one long paragraph and a smudge on the corner. Researchers think this plays a key role in comprehension — something that is more difficult on screens, primarily because the time we devote to reading online is usually spent scanning and skimming, with few places (or little time) for mental markers.
Another significant problem, especially for college students, is distraction. The lives of millennials are increasingly lived on screens. In her surveys, Baron was surprised by the results to the question of whether students were more likely to multitask in hard copy (1 percent) vs. reading on-screen (90 percent). "When a digital device has an Internet connection, it's hard to resist the temptation to jump ship."