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. 2019 Sep 12;13:941. doi: 10.3389/fnins.2019.00941

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Copyright © 2019 Ríos-Herrera, Olguín-Rodríguez, Arzate-Mena, Corsi-Cabrera, Escalona, Marín-García, Ramos-Loyo, Rivera, Rivera-López, Zapata-Berruecos and Müller.

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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(A) Correlation coefficient between the earlobe A1 and active electrodes T3, Cz and T4 estimated with a running window of length 3,840 data points (corresponding to 30 s) over the whole night recording of a clinically healthy, 26-year-old male subject. Sleep stages (W = awake, S1–S4 denotes sleep stages 1–4 and REM denotes Rapid Eye Movement sleep periods) are indicated by colored shadows in each panel. (B) Shows a heat map of the average correlation between the active electrodes and A1 and (C) the respective standard deviation. Both quantities are estimated over the whole night recording.