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. 2015 Nov 27;9:645. doi: 10.3389/fnhum.2015.00645

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Copyright © 2015 Pinhas, Buchman, Lavro, Mesika, Tzelgov and Berger.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Event-related potential traces averaged across the nine centro-parietal sites and the nine parieto-occipital sites used for analysis, as a function of congruency and pair type. The P3 peaked at around 330 ms poststimulus and was enlarged for congruent versus incongruent trials over centro-parietal sites, but not over parieto-occipital sites. (B) Mean amplitude values (microvolts) by congruency, pair type and electrodes location from 300 to 370 ms. Error bars denote 0.95 confidence intervals. (C) Topographic distributions (top view, full projection) of congruent minus incongruent trials at 330 ms for pairs containing the smallest number and for pairs containing non-smallest numbers. Centro-parietal sites are marked with gray squares and parieto-occipital sites are marked with black dots. The congruency effect (congruent minus incongruent trials) was enlarged for pairs containing the smallest number only over centro-parietal sites.