blindness to gorillas


Inattentional blindness; if you are concentrating on one static task, you often fail to notice dynamic movement.

In tests using a video of a group of basketball players catching a ball, 50% of observers do not see the gorilla wandering through the scene, and 25% of people don’t see the woman with the umbrella. When they are concentrating on counting the number of throws between the players.

“We feel like we’ve got all the details of the things going on around us,” Daniel Simons observes “But my bet is that most of the time people are really focused on one goal at a time.”

Also change blindness; finding that people often fail to detect change in their visual field, as long as the change occurs during an eye movement or when people’s view is otherwise interrupted.

detailed further reading…

great video demo


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