[FieldTrip] Question pertaining to frequency resolution
c.wijs at student.rug.nl
Tue May 18 14:53:58 CEST 2021
Dear Eelke, and others,
Thank you for your response. Is it then correct that even though my time
window of 500 ms constitutes a 2 Hz frequency, by adding a zero padding of
1 second, I can safely interpret the odd numbered frequencies (as was
discussed in the tutorial I mentioned in my original post/submission)?
Obviously I would report that for the analysis I applied zero-padding,
cause as you say, it is a bit of a trick.
The code I think to use would then be like this:
cfg = ;
cfg.output = 'pow';
cfg.method = 'mtmconvol';
cfg.taper = 'hanning';
cfg.keeptrials = 'yes';
cfg.pad = 1;
cfg.foi = 2:1:14; % analysis 2 to 14
Hz in steps of 1 Hz
cfg.t_ftimwin = ones(length(cfg.foi),1).*0.5; % length of time window
= 0.5 sec
cfg.toi = -0.1:0.004:0.6; % time window
"slides" from -0.1 to 0.6 sec in steps of 0.004, for example, 0.004 as I
have (EEG) sampling frequency of 250hz
TFRdata = ft_freqanalysis(cfg, data_clean);
Or could I even use an even smaller time window, such that I lose less of
my data and have a longer period over which I can analyse the power spectra?
Again thank you and have a nice day,
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