How to play
Two teams of dots pass balls around. Count the passes made by the amber team, and ignore the white team. Concentrate: it is harder than it looks.
Watch, then tap your answers · Or keys
Free in your browser, with ten levels that get harder. No account; your best scores stay on your device.
What the study found
People counting basketball passes often failed to see a person in a gorilla suit walk through the middle. The more the surprise looked like the team they were ignoring, the more they missed it. In a 2010 follow-up, people who already knew the gorilla video spotted the gorilla, but were slightly less likely to notice a curtain changing colour or a player leaving.
Simons and Chabris · Perception, 1999 · Simons · i-Perception, 2010
Why it matters
What you are looking for decides what you see, and that holds for everyone. So KOZMO asks many of the people doing the work how often specific things happen, and turns the answers into evidence a team can talk about.
It is for fun: the game does not measure you.
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