A young man steals across the hallway, slips through a door and scans the room. He opens a drawer, snatches a wristwatch inside and puts it in his pocket. Then he hurries out the door.
Sixty more people perform the same drill, half of them filching a watch and the others, a ring. Psychiatrist F. Andrew Kozel, now at the University of Texas Southwestern Medical Center at Dallas, and his colleagues promised to give a bonus payment to anyone who could conceal the deed from the scientists, who planned to look into their brains for signs of a cover-up.