Whoa! I remember trying an experiment a lot like this when I was in high school with a girlfriend that was really into psychology. She would go onto my bookshelf and place a book there that was new or should be unfamiliar to me and then we measured how long it took me to find a different book that was familiar to me. We thought having a new unpredictable book on the shelf slowed down the search. I now think our methods were bogus, but there was undoubtedly something that caused the new book to stand out when I was looking over the bookshelf.