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. 2020 Apr 15;14:113. doi: 10.3389/fnhum.2020.00113

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Copyright © 2020 Nagels-Coune, Benitez-Andonegui, Reuter, Lührs, Goebel, De Weerd, Riecke and Sorger.

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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Event-related averages of channels of interest in participant 17. The two graphs on the left are event-related averages from the first localizer run (mental drawing; MD). The two graphs on the right are event-related averages from the second localizer run (spatial navigation; SN). The top two graphs depict the oxygenated hemoglobin (HbO) response, whereas the bottom two graphs depict the deoxygenated hemoglobin (HbR) response. Each graph is the event-related average of 20 individual trials, with the darker average signal line and its standard deviation (lighter colored band surrounding the average signal line). Notice the absence of a typical hemodynamic response during both tasks: there is no clear positive deflection in HbO, nor a negative deflection in HbR. The gray band from 0 to 10 s signifies the mental imagery time interval.