Is this what you are referring to?
http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20000011599_2000009345.pdfHere is what I commented on Amazon.com.
The study referenced above seems to be based upon short dense texts of which a person, probably a student, would be expected to recall a high percentage. Photoreading is beneficial for all reading situations, but the greatest gains in time will be experienced in reading contexts characterized by the '80/20 rule'--indeed, most reading contexts. By and large, when we read a book or manual, we need fairly specific knowledge. The greater the percentage of a book's contents one must know, the more time must be invested in studying and processing the content--even here, though, the Photoreading step and overall process is beneficial. In my experience, a book that I have subjected to the Photoreading step is more accessible to me on further study. This is one way that I know that Photoreading does indeed "work", assuming that one is willing to *work* to the extent necessary.
