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Grand-mean evoked potentials for the Interaction of Task by Stimulus at electrodes POz, PO10h, and PO9h that showed significant Task or Stimulus effects (see Figures 3 and 4). Waveforms are plotted as the differences between letter and pseudoletters for each task (Orthography, Color, and Target). No statistical evidence of significant interactions were found at these electrodes or at any other scalp electrodes (data not shown) at p < 0.05, p < 0.01, and p < 0.001.
