I activated one book spontaniously by carrying it into the bathroom with me and then back out again. I'm thinking of doing a mind-map from my spontanious activation and then manually activating to see how I compare. Basically, the book I have is a large book of lists on how to have "the classic American childhood." Because the lists are generated from meta-values of the author, I was able to spontaniously figure out the meta-values and the rules for applying them.
I think part of it is that I generally reserve books for "bathroom reading" that I do not intend to photoread, but just want to crunch through in a straight line. My brain might have thought that I read it, because I photoread it and I took it into the bathroom. (I was going to superread it, but decided not to).