Why do so many can’t see the missing number? The answer is this: we are so used to see the correct sequence that our eyes simply slip by. Our brain sees the whole picture at once, without clinging to individual numbers.
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Psychologists have long been debating why our brain does not notice the obvious. In an experiment conducted by psychologists Christopher Chabry and Daniel Simons, people were shown a video of a basketball game and asked to count the number of passes in the game. In the middle of the video, a man in a gorilla costume passed through the crowd of spectators, but 50% of the viewers didn’t notice him! When the brain is focused on one thing, it often doesn’t notice anything around.