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. 2013 Feb 20;8(2):e57174. doi: 10.1371/journal.pone.0057174

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© 2013 Nambu 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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Each figure shows the averaged ERP responses at electrode Pz for each subject (Sub1–Sub7). The horizontal axis denotes time from auditory onset, and the vertical axis shows the ERP amplitude. The red line shows the ERP for target trials and the black line shows the ERP for non-target trials. The gray bar at the bottom of each figure indicates the significant difference between target and non-target waveforms (Mann-Whitney U test, p<0.01).