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Experimental protocol. The basic trial structure of Experiments 1-4 involved a task cue, followed by a cue-to-stimulus-interval (CSI) preceding a target stimulus display, followed by accuracy feedback. Experiment 1 included two CSI conditions (timing parameters for the short CSI condition are shown in orange, the long CSI condition in gray). Experiments 2-4 employed only the short CSI condition, and Experiments 2 and 3 added a colored frame to the target stimulus (see main text).
