Carnegie Mellon Study Suggests Repetition of Rare Events Could Reduce Screening Mistakes by Security Officers Carnegie Mellon News (PA) (11/04/13) Spice, Byron Carnegie Mellon University (CMU) researchers suggest security guards could improve their detection rates through repetition. In experiments that simulated multiple-camera video surveillance, the researchers found that study participants failed to correctly detect threats about 45 percent of the time when exposed to two threat events over the course of two hours. However, the error rate declined to 25 percent when encountering 25 events in the same period of time. If people know what theyre looking for and havent seen it for some time, or their attention is focused elsewhere, they wont necessarily see what theyre looking for, even when it is in full view, says CMUs Judith Gelernter. The experiments results indicate that one way to make threat detection more effective is to have security screeners routinely encounter and respond to simulated threats. In the CMU experiments, 108 participants underwent 30-minute training sessions to learn how to detect low- and high-level threats. Then, during the two-hour experiment, 10 interior building views alternated to cover four quadrants of a computer monitor, with each view lasting a minute, which is similar to actual surveillance video.
Posted on: Mon, 11 Nov 2013 19:25:19 +0000
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