A recurring theme in experimental psychology is the narrowness of perception: how very little of the sensory clamor makes its way into awareness. Earlier in the day, before the magic show, a neuroscientist had demonstrated a phenomenon called inattentional blindness with a video made at the Visual Cognition Laboratory at the University of Illinois.
In the video, six men and women — half with white shirts and half with black — are tossing around a couple of basketballs. Viewers are asked to count how many times members of, say, the white team, manage to complete a pass, keeping the ball from the opposition. I dutifully followed the instructions and was surprised when some 15 seconds into the game, laughter began to ripple through the audience. Only when I watched a second time did I see the person in the gorilla suit walking on from stage left. (The video is online at viscog.beckman.uiuc.edu/grafs/demos/15.html.)
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