Searching for targets in complex scenes like X-ray baggage screening is demanding. One cause of impairedsearch performance is the superimposed objects of X-ray images. In this study, we compared searching forthreat items in a superimposed display and a sparse display. Using both behavioral and eye movementmeasures, we explored the effects of superposition on search course. As expected, superposition affectedaccuracy rates and response times. Results showed searching in the superimposed display caused longerfixation durations, and the effect was pronounced throughout the search trial. We also found longer searchinitiation time and target verification time in superposition, suggesting that the initial planning ofoculomotor guidance and target recognition was influenced.
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