[FieldTrip] cluster-based permutation test on WPLI

Zsolt Turi zsoltturi at gmail.com
Wed May 13 17:28:39 CEST 2015

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

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?

If I am right, which command shall I use to organize individual WPLI data,
in order to create a correct input for ‘ft_freqstatistics’. According to
the tutorial, in case of time-frequency data it is ft_freqgrandaverage.
However, if I use it for WPLI data, I have the following error: “This
function requires freq data as input”.

Could you please recommend me a tutorial, reference documentation or some
comment on this issue?

Thanks for any suggestions in advanced and let me know if the description
 of my problem is not clear!


Ph.D. student
Department of Clinical Neurophysiology
Georg-August University, Göttingen
Robert-Koch-Str. 40
37075 Goettingen
Web: http://www.uni-goettingen.de/en/222525.html
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