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Local and global prevalence effects in Experiment 2. The upper data points (squares) show target-absent trials. Circles are target-present trials. Open squares and circles show RTs as a function of local prevalence averaged over 10 preceding trials. Filled squares and circles show average target-absent RTs for each prevalence block. Data are plotted only for those conditions producing at least 150 trials across 15 observers. Error bars represent ±1 SEM
