He then asked a bunch of radiologists to review the slides of lungs for cancerous nodules. He took a picture of a man in a gorilla suit shaking his fist, and he superimposed that image on a series of slides that radiologists typically look at when they're searching for cancer. "You might expect that because they're experts, they would notice if something unusual was there," he says. That effect is called "inattentional blindness" - which brings us back to the expert lookers, the radiologists.ĭrew wondered if somehow being so well-trained in searching would make them immune to missing large, hairy gorillas. So, often, they literally can't see even a huge, hairy gorilla that appears directly in front of them. This is because when you ask someone to perform a challenging task, without realizing it, their attention narrows and blocks out other things. "There's a gorilla on the screen - of course you're going to see it! But 50 percent of people miss the gorilla." The kids keep playing, and then the video ends and a series of questions appear, including: "Did you see the gorilla?" He stops momentarily in the center of the circle, looks straight ahead, beats his chest, and then casually strolls off the screen. Then, about a half-minute into the video, a large man in a gorilla suit walks on screen, directly to the middle of the circle of kids. Because the players are constantly moving around, viewers really have to concentrate to count the throws.
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