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. 2012 Jul 30;7(7):e42233. doi: 10.1371/journal.pone.0042233

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© 2012 Li et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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(A) Grand-average stimulus-related ERP waveforms at midline sites (Fz, Cz, Pz) are shown for the 14 subjects in long CSI conditions across both repeat and switch trials. In all the repeat and switch trials, a slow central and parietal negativity emerged at about 300 ms after stimulus onset. (B) Brain topographies in the long CSI conditions across repeat (mid) and switch trials (top) and the difference topographies between switch and repeat trials (bottom) are shown.