Dual-target search for high and low prevalence X-ray threat targets |
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Authors: | Hayward J. Godwin Tamaryn Menneer Kyle R. Cave Nick Donnelly |
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Affiliation: | 1. University of Southampton , Southampton, UK hayward.godwin@soton.ac.uk;3. University of Southampton , Southampton, UK;4. University of Massachusetts Amherst , Amherst, MA, USA |
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Abstract: | Recent studies have shown that the prevalence of target presentation in visual search has an impact on target detection rates, and also that searching for two targets leads to a decrement in performance (the “dual-target cost”). In the present experiments, we added to previous work that has examined the interaction between the prevalence effect and dual-target cost, and also to previous work that has examined a full range of prevalence levels. We found no interaction between the dual-target cost and prevalence effect, though the response criterion in dual-target search did interact with target prevalence in an unexpected manner. Furthermore, we detected anasymmetry in the prevalence effect: It was more marked for high than low prevalence. Implications for real-world tasks are discussed. |
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Keywords: | Airport security Dual-target search Low prevalence Signal detection Visual search |
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