Same effect also works on "find differences" type of puzzles. Before you know where they are pictures look the same and you need to focus your attention on smal

Same effect also works on "find differences" type of puzzles. Before you know where they are pictures look the same and you need to focus your attention on small part of the picture with few features. Once you know where differences are they immediately jump out to you. I suspect same cognitive information bias is part of the reason most people believe themselves to be more intelligent than average.