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. 2018 Jan 15;8:715. doi: 10.1038/s41598-017-19009-y

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Grand average waveforms for the three groups. For graphic presentation purposes only, two virtual channels were created by merging ERPs from all the channels included in two clusters. The two virtual channels corresponding to the left and right fronto-central clusters are shown. The waveform relative to the standard condition (STD, black line) is plotted against the waveforms relative to the frequency deviant condition (DEVF, red line) and the duration deviant condition (DEVD, blue line). In addition, the difference waveforms relative to MMRF (DEVF minus STD; orange dotted line) and MMRD (DEVD minus STD; light-blue dotted line) are plotted. ERPs are time-locked to the onset of the first tone in the pair. Negative voltage is plotted upward. In order to highlight the significant results, the overall time-window of interest where mean amplitude was computed and peak latency was extracted (350–620 ms) is defined through squares.