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Attention operating characteristic for Experiment 1. Observed accuracy, measured as area under ROC curve, in single (blue) and dual (red) tasks in the unilateral condition (A) and bilateral condition (B). Error bars are the standard error of the mean. Solid line: prediction of the independent parallel model. Dashed line: prediction of the all-or-none serial model. Dotted curve: prediction of the fixed-capacity parallel model.
