[FieldTrip] cluster-based permutation test on WPLI

[Zsolt Turi]

Hi Tzvetan and Chris,

thanks for your emails.
Removing channelcmb and adding a new one called label solved my problem.

Chris:
I'ld like to compare the WPLI difference of two conditions, congruent and
incongruent ones by using a within-subjects design (so not a between trials
comparison).
>From your email I may infer  that after running wpli, I should still have
my trials. However, I do not have repetitions (trials) anymore in the
output structure. Am I doing an illegitimate step during wPLI calculation
or miss one specification?

cfg                = [];
cfg.method     = 'wpli';
dataWPLI       = ft_connectivityanalysis(cfg,TFRhann);


 labelcmb: {9x2 cell}
     dimord: 'chan_freq_time'
wplispctrm: [9x43x16 double]
          freq: [1x43 double]
          time: [-0.5000 -0.4004 -0.3008 -0.1992 -0.0996 0 0.0996 0.1992
0.3008 0.4004 0.5000 0.5996 0.6992 0.8008 0.9004 1]
           cfg: [1x1 struct]

Thanks for your help!

Best,
Zsolt




2015-05-18 8:18 GMT+02:00 Tzvetan Popov <tzvetan.popov at uni-konstanz.de>:

> Hi Zsolt,
>
>
> Hi Tzvetan,
>
> thanks for your suggestions.
> I am still stucked at the ft_freqstatistics, as I keep on receiving the
> following error and would be glad if you could make a comment on this as
> well:
>
> ####
> Reference to non-existent field 'label'.
>
> Error in ft_freqgrandaverage (line 123)
>         cfg.channel = ft_channelselection(cfg.channel, varargin{i}.label);
> ###
>
> Is it because I have labelcomb in the WPLI data?
>
> yes
>
>
> labelcmb: {9x2 cell}
>         dimord: 'chan_freq_time'
>     wplispctrm: [9x7x16 double]
>           freq: [3 4 5 6 7 8 9]
>           time: [-0.5000 -0.4004 -0.3008 -0.1992 -0.0996 0 0.0996 0.1992
> 0.3008 0.4004 0.5000 0.5996 0.6992 0.8008 0.9004 1]
>            cfg: [1x1 struct]
>
> And this is my specification (I couldn't fine the option cfg.channelcmb
> for ft_freqgrandaverage in the reference documentation):
>
> again try to give cell arrays as input to ft_freqanalysis. I’m still
> considering the case you mentioned in your initial e-mail, one channel etc.
> e.g. cfg.channel = ‘FCzF3’;
>        cfg.parameter = ‘wplispctrm’;
>        cfg.neighbours = []; % this will force clustering over time and
> freq dimension
>
> best
> tzvetan
>
>
> cfg                          = [];
> cfg.keepindividual    = 'yes';
> cfg.cfg.foilim           = 'all';
> cfg.toilim                = 'all';
> cfg.channel            = 'all';
> cfg.parameter         = 'wplispctrm';
>
> Thanks again for the answer in advance!
>
> Best,
> Zsolt
>
> ps.I can provide other parts of my code but I don't want to make this mail
> too long :
>
>
>
> 2015-05-13 19:14 GMT+02:00 Tzvetan Popov <tzvetan.popov at uni-konstanz.de>:
>
>> 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
>> tzvetan
>>
>>
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>
>
>
> --
> ************************************************************
> Ph.D.
> 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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-- 
************************************************************
Ph.D.
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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