This is a follow-up to
Ebook content versus physical book content
I experienced that on my 6,8" ebook reader I focus on a too small area, thereby I cannot remember well to the contents. I cannot "take a photo" of the page as I would do with a large enough printed book.
Also, I remember less about where a topic was discussed.
Is there a scientific treatise on comparing ebooks and printed books from this point of view?