The probability of target presentation in visual search tasks influences target detection performance: this<br/>is known as the prevalence effect (Wolfe et al., 2005). Additionally, searching for several targets simultaneously<br/>reduces search performance: this is known as the dual-target cost (DTC: Menneer et al., 2007).<br/>The interaction between the DTC and prevalence effect was investigated in a single study by presenting<br/>one target in dual-target search at a higher level of prevalence than the other target (Target A: 45% Prevalence;<br/>Target B: 5% Prevalence). An overall DTC was found for both RTs and response accuracy. Furthermore,<br/>there was an effect of target prevalence in dual-target search, suggesting that, when one target is<br/>presented at a higher level of prevalence than the other, both the dual-target cost and the prevalence<br/>effect contribute to decrements in performance. The implications for airport X-ray screening are<br/>discussed
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