Yeah, there is something to that, since that occationally happens to me. Just about everytime I get "The Itch" is during Photoreading and it seems I can PR better. Maybe because I'm not conciously thinking about the book in front of my nose(?) and I have my attention on the itch.
On the other hand...
It may also be that the atrophied part of my brain that I have been told not to use by the education system is now slowly regenerating back to health!! ;-)