[FieldTrip] Equating power spectral density

Chang, Ariel ariel.chang at yale.edu
Fri Jun 10 19:57:24 CEST 2016

Hi all,

I don’t quite understand the effects of tapering for power estimates. I have resting data segmented into 2 second epochs. With the following parameters, could someone explain how to equate the data’s power spectral density back to it’s original spectral density (in the for loop)?

cfg.method = 'mtmfft';

cfg.taper      = 'dpss'

cfg.polyremoval = 1;

cfg.tapsmofrq = 1;

cfg.foilim    = [2 80];

cfg.pad= 100;

data2 = eeglab2fieldtrip(EEG, 'preprocessing');

sizedat = size(EEG.data);

    for i = 1:sizedat(3)

        data2.trial{i} = data2.trial{i}*10;


[freq2] = ft_freqanalysis(cfg, data2);

Thanks in advance!


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