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. 2019 Jul 23;13:748. doi: 10.3389/fnins.2019.00748

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Copyright © 2019 Carrera-Cañas, Garzón and de Andrés.

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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Representative 40-s epochs of polygraphic recordings in one animal from (left) the end of SWS before REM sleep, (middle) the SPGO state, and (right) the beginning of a REM sleep episode. The red line shows how, within the SWS episode, the last seconds display EEG voltage changes that would correspond to the IS. These voltage features are visually similar to cortical and hippocampal leads in the SPGO state. Vertical calibration: 100 μV. EOG, electrooculogram; EMG, electromyogram; LGN, lateral geniculate nucleus; HPC, hippocampus; FC-R, frontal cortex-reference; OC-R, occipital cortex-reference. OC-δ, isolated delta band (1.5–3.5 Hz) from the occipital cortex.