With me repeated Photoreadings help activating the material. Since it's the least time consuming part of it- why not do it over again as another preview? As far as memory and the subconscious end of it- I can pick up books I read in grade school and just looking at it takes me back and I instantly recall the story and details. From what I understand everything you ever read or saw is stored away and you can get to it again by jogging your memory. Jogging your memory is finding the bridge back to it by reviewing it. Helping someone with algebra (if you haven't worked with it in years) shows you how it works. Read up on it for a few hours and it all comes back to you.
