Lets use the term "adorn" to additions to articles done by students: Highlighting, writing margin notes, questions, comments, connecting with lines, drawing arrows, doodling - Anything used in the digesting process that wasn't on the page before ;)
For a small research I'm doing, I'm looking for previous work on the subject. How adorning varies, and what are the factors affecting how it's done, it's effect on understanding, etc.
So...