In their experiment, Simons and Chabris (1999) asked participants to watch a video that shows three young college-age adults wearing white T-shirts, passing a basketball, and three young college-age adults wearing black T-shirts, passing another basketball.They found that participants could not accurately track the passes when a person in a gorilla suit interrupted the game.

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In the experiment by Simons and Chabris (1999), participants were asked to count the passes among players wearing the same color shirts, and many failed to notice a person in a gorilla suit walking through the scene, not because they couldn't track the passes, but because their attention was so focused on counting the passes that they missed the unexpected event.

In Their Experiment, Simons and Chabris (1999) Asked Participants to Watch