Why stop after 20 minutes? Breaks and target prevalence in a 60-minute X-ray baggage screening task
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03/2020
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01A - Journal article
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International Journal of Industrial Ergonomics
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Elsevier
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Abstract
Current EU regulation restricts continuously reviewing X-ray images of passenger baggage to 20-min duration as
a precautionary measure to prevent performance decrements in airport security officers (screeners). However,
this 20-min limit is not based on clear empirical evidence on how well screeners can sustain their performance
over time. Our study tested screeners in a 60-min simulated X-ray cabin baggage screening task. One group took
10-min breaks after 20 min of screening; the other group worked without breaks. We found no decrease in
performance over 60 min in either group. Breaks did not affect performance, but they did reduce the amount of
subjective distress. By varying target prevalence, we found that da with a slope of about 0.6 is a more valid
measure of detection performance than d’. Target prevalence caused a criterion shift. Our results provide a basis
for conducting field studies of prolonged screening durations, and open the discussion on whether more flexible
break policies and work schedules should be considered.
Keywords
X-ray image inspection, Visual search, Time on task, Breaks, Detection measures, Target prevalence effect
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0169-8141
1872-8219
1872-8219
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English
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Yes
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Published
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BUSER, Daniela, Yanik STERCHI und Adrian SCHWANINGER, 2020. Why stop after 20 minutes? Breaks and target prevalence in a 60-minute X-ray baggage screening task. International Journal of Industrial Ergonomics. März 2020. DOI 10.1016/j.ergon.2019.102897. Verfügbar unter: https://irf.fhnw.ch/handle/11654/30755