The analyzed EEG time epochs lasted for 1,200 ms (300 ms pre-stimulus and 900 ms post-stimulus). Waveforms were averaged off-line for ERPs calculation. To avoid eye movement in the processed EEG, all epochs with excessive eye movements (>120 μV) were eliminated from the average calculation. On average, more EEG epochs in depressive patients were eliminated than the other groups after the artifact rejection (36.7% of all epochs in depressive patients were eliminated vs. 18.4% in healthy group and 27.5% in anxiety group).
