Fig. 4 | Scientific Reports

Fig. 4

From: Automated depression detection via cloud based EEG analysis with transfer learning and synchrosqueezed wavelet transform

Fig. 4

Example EEG signal segments from (a,b) Database I and (c,d) Database II, each spanning 30 s. The vertical axis represents the signal amplitude (in microvolts, μV), and the horizontal axis represents time (in seconds). These segments illustrate raw EEG activity from different subject groups (normal vs. depressed), highlighting variations in brainwave patterns.

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