[FieldTrip] questions about topoplot and notch filter
wanyu at gazzaleylab.ucsf.edu
Tue Apr 14 00:48:45 CEST 2015
Recently I am analyzing EEG dataset with only 20 channels and I am focusing
on coherence between frontal and posterior electrodes in frequency domain.
I got two questions here:
1. I wanted to topoplot the coherence between each pair of electrodes that
we're interested in, and I tried the following script:
cfg = ;
cfg.colorparam = 'plvspctrm';
cfg.layout = 'biosemi64.lay';
The electrode layout and coherence we wanted to see were in the plot, but
the plot did not show coherence related to FP1, FP2, and FPz. Am I doing
2. I would like to apply notch filter to remove 6 Hz and first I tried
cfg.dftfreq = 
but the 6Hz signal was still there.
Then I also tried
cfg.bsfreq =[5 7];
This worked well to remove 6Hz signal, but it also affected 5Hz and 7Hz.
Is there any way to remove 6 Hz specificlly?
Any help would be appreciated.
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