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Fig. 1. —Graph shows mean cumulative number of case decision outcomes as function of time to decision for mammographers for final-decision phase. Most true-positive responses ([UNK]) were made within 40 sec. These responses were offset by false-positive responses for cases with normal findings () and false-positive responses for cases with abnormal findings () that began to influence performance at 20 sec. False-positive responses for normal cases continued to influence performance throughout time course of viewing, but false-positive responses for abnormal cases leveled off at approximately 40 sec, and true-positive responses continued to outweigh false-positive responses for both normal and abnormal cases throughout time of viewing.