Dear Attention Selectors,

Several years ago, psychologists Christopher Chabris and Daniel Simons developed a video to confirm the condition named selective attention. In the video, two teams of students, one wearing black shirts and the other wearing white shirts, pass basketballs to each other. The viewer is challenged to count the number of times the white shirt team passes their ball. After viewing, the study participants were told the correct number of passes and asked to report the difference between that number and their count as observers. They were then asked if they saw the gorilla—a surprising number had not.