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Experiment 4: Effect of covert attention as a function of stimulus intensity. A, B, The contrast of both disks was simultaneously manipulated (see icons) and attention was directed to the bright (A) or dark (B) disk. C, D, Only the bright (C) or the dark (D) disk was presented and subjects attended to the disk or the gray background on the opposite side of fixation. All conventions as in Figure 1.
