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. 2021 Apr 14;15:641273. doi: 10.3389/fnhum.2021.641273

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Copyright © 2021 Xu, Ye, Hämäläinen, Ruohonen, Li and Astikainen.

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) and the copyright owner(s) 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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The grand-averaged responses for (A) FRE, (B) UR, and (C) PR. The upper panel shows a butterfly view of the grand-averaged response for each stimulus type from all 306 sensors. For visualization purposes, gradiometer values are multiplied by 0.04 due to the differing units for magnetometers (T) and gradiometers (T/m). The middle and lower panels show the topographies of the sensor-level activity based on magnetometers and source activation, respectively, at a time point of 55 and 150 ms for each stimulus type. In the lower panel, only the sources that have a value > 40% of the color bar maximum are displayed. FRE, frequent stimulus; UR, unpredictable rare stimulus; PR, predictable rare stimulus.