I want to use directed transfer function (DTF) to EEG data to do some causality analysis, and I am trying to know to effect of digital filtering on the data. Currently I am using EEGLAB 14.0.
I have learned the new, default basic FIR filter in EEGLAB will cause a constant phase delay in all frequency component of the signal. Is the phase delay also consistent in all the channels?
Also I have notice that there is some 50Hz line noise in my data. The EEGLAB Firfilt FAQ (https://sccn.ucsd.edu/wiki/Firfilt_FAQ) discourages the use of notch filter to eliminate the noise, and suggests to use a CleanLine() plugin, but in some resent publications people seems to directly us notch filters (such as this one: http://www.sciencedirect.com/science/article/pii/S0165027011004687). Which method is actually suggested?
These links will be usefull
https://sccn.ucsd.edu/wiki/Chapter_04:_Preprocessing_Tools#Filtering_the_data
https://sccn.ucsd.edu/wiki/Makoto%27s_preprocessing_pipeline#High-pass_filter_the_data_at_1-Hz_.28for_ICA.2C_ASR.2C_and_CleanLine.29
https://sccn.ucsd.edu/~arno/mypapers/ComputationIntelligenceDelorme.pdf
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