Figure 1 | Scientific Reports

Figure 1

From: Slow wave synchronization and sleep state transitions

Figure 1

EEG slow wave activity can be separated as independent time series by empirical mode decomposition (EMD). Five seconds of single channel EEG signal during slow wave sleep (SWS) is shown in the top panel. The bottom 5 panels show the first 5 intrinsic mode functions (IMF1 to IMF5) extracted by EMD. The frequency range for IMF3 to IMF5 is within the slow wave oscillations frequency, thus a large amplitude of these 3 IMFs indicates the presence of SWS.

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