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Attention blindness
There is an interesting video demonstrating that this can occur even while not under stress. The video has people in white shirts throwing a large ball around to each other in a room. The video is shown with the instruction that the viewer watch the ball and count the number of times it is caught by a person in a white shirt. Most people watch and report the number of catches. The instructor then asks "who saw the gorilla?". Few do on the first viewing. On second viewing after being told about the gorilla, you see a guy in a gorilla suit slowly walking between the people throwing the ball. I couldn't believe that I didn't see it!
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