Simons and Chabris showed a video of students passing a basketball and asked participants to count how many passes made. In the video, a person in a gorilla suit walked through the basketball players for 5 seconds. Approximately how many of the participants reported seeing the "gorilla"

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Approximately 54% of the participants reported seeing the "gorilla." This experiment by Simons and Chabris is a famous demonstration of the phenomenon known as "inattentional blindness," where individuals fail to perceive an unexpected stimulus that is in plain sight because their attention is focused on another task or aspect of their environment.

Simons and Chabris Showed a Video of Students Passing a Basketball