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Procedure in Experiment 1. Shown are example trial sequences for the single task (A, top right location cued) and dual task (B, unilateral: both right locations cued; C, bilateral: both top locations cued). In these examples, the observer cue color is red. Mean blank interstimulus interval (ISI) durations shown; these were adjusted separately for each observer to produce ∼80% accuracy in the single task.
