Making the most of a second look

IT SOUNDS straightforward: give staff a second chance to examine images, and you could cut error rates in medical image analysis or improve airport baggage screening. But second viewings don’t always work, because people might focus on the same areas they looked at first time around, says Pernilla Qvarfordt of the FX Palo Alto Laboratory in California. Now Qvarfordt and colleagues think they have found a way to uncover detail that may have been missed. They devised a system that uses eye-tracking technology to identify which areas within an image have been checked by the viewer. On a second viewing,
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