On the importance of paper for focus

While reading about the impact of e-readers on literacy, I couldn’t help but think of the “distraction” that the devices offer to readers and how this can impact their learning. With paper, you are kind of “stuck” with the single dimensional content and this has the effect of focusing the reader on the task at hand. With an electronic device, there is a constant background “urge” to move to something else and I wonder how that impacts learning.