Fig. 1From: The applied principles of EEG analysis methods in neuroscience and clinical neurologyExample of time-invariant electroencephalogram (EEG) based on sleep EEG. The data come from the C3, C4, O1, and O2 channels (10–20 system). a EEG data for a short sleep time of 5 s. b EEG data for a long sleep time of 150 sBack to article page