[FieldTrip] Calculating single PLI value for a frequency band
e0046902 at gmail.com
e0046902 at gmail.com
Sun Apr 3 06:42:50 CEST 2022
Dear all,
I am novice to EEG analysis and I am trying to calculate Phase Lag Index for
my resting state data.
I have redefined the data as 2 sec trials and then run ft_frequencyanalysis
with "powandcsd" as cfg.output:
cfg = [];
cfg.length = 2;
data_trials = ft_redefinetrial(cfg, data);
cfg = [];
cfg.method = 'mtmfft';
cfg.taper = 'hanning';
cfg.foilim = [8 13]; % I want to look only at alpha band
cfg.keeptrials = 'yes';
cfg.pad='nextpow2' ;
cfg.output='powandcsd';
freq = ft_freqanalysis(cfg, data_trials);
cfg = [];
cfg.method = 'wpli';
PLI= ft_connectivityanalysis(cfg, freq);
With the above script, I get an output of PLI with the dimension of trials x
channel x channel x frequency.
Is there a way I can get one PLI index for each trial, for each channel
combination, across the frequency band I specified. Essentially, how can I
get PLI values with dimensions: trials x channel x channel
I am very new to this so any help is appreciated. Also, If I am trying to
filter my results to only the alpha band (8-13hz), is what I am doing the
correct way to achieve this?
Thank you,
Avi
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