In a quiet room at Raleigh-Durham International Airport, , Duke University challenged TSA Officers against Duke University students in a test measuring visual searching ability. What the study found was that TSA Officers were more accurate in finding the target than the members of the Duke community. They also took more time, so it’s more of a methodical search, which led to better performance, according to Duke University psychologist Stephen Mitroff, who led the research, which is part of a broader Department of Homeland Security funded initiative.
Approximately 206 TSA Officers took the test and were shown a series of images that contained eight to 32 shapes and told to find one that looked like a perfect letter T.
To make things tricky, half of the screen shown didn’t contain the right shape at all.
Them, the exact same test was given to 93 Duke undergraduates.
Mitroff called it “a very simple search task,” but it was designed to put everyone on equal footing, testing their raw search abilities. Real baggage scan images would have confused the amateurs and TSA screeners would have had an advantage.
The students were 82 percent accurate at finding the target shapes and took 3.86 seconds per scan, on average. The TSA officers took more than 6 seconds, but had accuracy rates of 87 to 88 percent.
Consistency was key factor for the most experienced screeners. TSA agents who took about the same amount of time each time they looked a scan were the most precise. Mitroff said this is likely because they’ve developed a visual scanning system that works whether they’re looking for the perfect letter T on a computer screen, or a gun on an airport scanner.
“Our interpretation is those who are most experienced have found their strategy and use it the same way over and over – whether you spiral through the bag or are zig-zagging left and right. If you’re always doing the strategy and always doing it consistently, you’re freeing up your cognitive resources — your other abilities to try to identify targets,” Mitroff said.
He and his team have presented the results at TSA headquarters, noting the agency was “very interested in the project.”
The TSA and the Department of Homeland Security did not respond to requests for comment for this story. The study is published online in the journal, “Visual Cognition.
— Dwight Donatto