[FieldTrip] cluster-based permutation test on WPLI

Tzvetan Popov tzvetan.popov at uni-konstanz.de
Wed May 13 19:14:45 CEST 2015

Hi Zsolt,

> Dear all,
> I would like to perform a cluster-based permutation test on weighted phase lag index values by using a within-subjects experimental design. I have two conditions (congruent and incongruent one) and my goal is to compute WPLI between certain channel combinations (FCz and F3 for instance) and see the WPLI change let’s say in 3-9 Hz and -100 to 500 ms between the two conditions.
> I experienced some difficulties after the point when I calculated the WPLI data for each participant. To perform the above-mentioned comparison, shall I use ‘ft_freqstatistics’for the cluster-based permutation test?
You could. Stick with the tutorial you are currently working with. You should organize your data into cell arrays and call ft_freqstatistics like this: stat = ft_freqstatistics(cfg, congruent{:}, incongruent{:}). Furthermore you should specify cfg.parameter = ‘wplispctrm’ otherwise ft_freqstatistics will default to ‘powspctrm’ which will be not present in the data.
good luck

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