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Observers’ mean correct reaction times (RTs; in milliseconds; Figures 3A and 3B) and error rates (proportion; Figures 3C and 3D) for present and absent vertical targets as a function of set size for feature (Figures 3A and 3C) and conjunction (Figures 3B and 3D) searches under the fixed-viewing conditions (150-ms stimulus duration) and the free-viewing conditions of Experiment 1.
