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In many socially important search tasks (e.g., medical screening and airport security) targets are rare. This effect reflects a shift in decision criterion, rather than a loss of sensitivity (Wolfe et. al, 2007). Miss error rates are 2-3 times higher at low (1-2%) target prevalence than at high (50%) prevalence (Wolfe et. al, 2007, Wolfe et. al, 2005). High prevalence Low prevalence GOAL: To reduce low prevalence miss errors by getting observers to maintain a high prevalence criterion under low prevalence conditions Methods Search Task: Is a gun or knife (target) present or absent? Respond quickly and accurately Low Prevalence: targets present in 2% of bags High Prevalence: targets present in 50% of bags On each trial, a fixation cross and audible 'click' were followed by the appearance of a bag The bag remained visible until observers responded

Curing the prevalence effect in visual search