Abstract：
Previous studies suggest that performance in visual inspection and typical vigilance tasks depend on time on task and task load. European regulation mandates that security officers (screeners) take a break or change tasks after 20 min of X-ray baggage screening. However, longer screening durations could reduce staffing challenges. We investigated the effects of time on task and task load on visual inspection performance in a four-month field study with screeners. At an international airport, 22 screeners inspected X-ray images of cabin baggage for up to 60 min, while a control group (N = 19) screened for 20 min. Hit rate remained stable for low and average task loads. However, when the task load was high, the screeners compensated by speeding up X-ray image inspection at the expense of the hit rate over time on task. Our results support the dynamic-allocation resource theory. Moreover, extending the permitted screening duration to 30 or 40 min should be considered.
摘要：
先前的研究表明，视觉检查和典型的警惕任务的表现取决于时间和任务负荷。欧洲法规要求安全人员（筛查人员）在进行X射线行李筛查20分钟后休息或更改任务。然而,更长的筛查持续时间可以减少人员配备方面的挑战.在为期四个月的现场研究中，我们调查了时间对任务和任务负荷对视觉检查性能的影响。在一个国际机场,22名筛查人员检查了客舱行李的X射线图像长达60分钟，而对照组(N=19)筛选20分钟。对于低任务负载和平均任务负载，命中率保持稳定。然而,当任务负载很高时，筛查人员通过加快X射线图像检查以牺牲任务的命中率来补偿。我们的结果支持动态分配资源理论。此外，应考虑将允许的筛查持续时间延长至30或40分钟.
