Fig. 2
From: Neural responses to social decision-making in suicide attempters with mental disorders
The calculation processes of the Modulation Index in a 3 s data file. From the raw signal shown in black, low- and high- frequency time series components denoted in green, respectively, were extracted using the finite impulse response filters. For both signals, the low-frequency phase and high-frequency envelope were calculated using the Hilbert transform highlighted in red. By binning the envelope values for each phase bin, the high-frequency amplitude distribution (or amplitude probability) for a phase was calculated