[FieldTrip] Urgent: Error in Source Statistics, Group level
Chaitanya Srinivas
chaitanya.pro at gmail.com
Sun Jan 26 09:06:28 CET 2014
Hi Eelke,
I looked at the stat.stat values if that is what you mean. There
are some NaNs , but also some values. Similarly in stat.prob, there are
some 1's. The stat.mask is all zeros as you say.
Any further suggestions from you?
Thank you
*===============================================*
*[image: Inline image 1]*
*Best Regards*
*Chaitanya Srinivas Lanka Wiss. Mitarbeiter
*
*PhD StudentFunctional and Restorative Neurosurgery Neural Information
ProcessingNeurosurgical University Hospital*
* Graduate Training Center for Neuroscience Eberhard Karls
University Eberhard Karls University
**Otfried-Mueller-Str.45
Österbergstr. 3*
* D-72076 Tuebingen **D-72074 Tuebingen*
*Mobile Phone Number : +49-176-79035731*
*===============================================*
On Sun, Jan 26, 2014 at 8:53 AM, Eelke Spaak <eelke.spaak at donders.ru.nl>wrote:
> Dear Chaitanya,
>
> Perhaps an obvious question: do you find any significant differences in
> the statistics step (inspect the stat structure)? If not, the mask will
> consist of all zeroes, hence giving you a 'blank' plot.
>
> Best,
> Eelke
>
>
> On 26 January 2014 08:46, Chaitanya Srinivas <chaitanya.pro at gmail.com>wrote:
>
>> Dear fieldtrip users,
>> I would like to do sourcestatistics on a group level with eeg data. I have a
>> pre and post intervention measurement for each of my 10 subjects
>> . After source reconstruction using an DICS beamformer
>> and volume normalization, I calculated the sourcegrandaverage for the pre and
>> post condition and i have avg.pow for each subject.
>>
>> However, when I use the grandaverage results in ft_sourcestatistics in the
>> configuration shown below and plot the result I just get a blank anatomical
>> mri. It only runs with cfg.parameter="pow" .I tried with cfg.parameter = 'avg.pow' it doesnt run.
>> Do I have to set any additional parameters or am I making some mistake?
>>
>>
>> cfg=[];
>> cfg.dim = grandAVGsourcePre.dim;
>> cfg.method = 'montecarlo';
>> cfg.statistic = 'depsamplesT';
>> cfg.parameter = 'pow';
>> cfg.correctm = 'cluster';
>> cfg.numrandomization = 1000;
>> cfg.alpha = 0.05;
>> cfg.tail = 0;
>>
>> nsubj=length(sourcePre.trial);
>> cfg.design(1,:) = [1:nsubj 1:nsubj];
>> cfg.design(2,:) = [ones(1,nsubj) ones(1,nsubj)*2];
>> cfg.uvar = 1;
>> cfg.ivar = 2;
>> stat = ft_sourcestatistics(cfg, grandAVGsourcePre, grandAVGsourcePost);
>>
>>
>> *and next interpolation*
>> cfg = [];
>>
>>
>> cfg.voxelcoord = 'no';
>> cfg.parameter = 'mask';
>> cfg.interpmethod = 'nearest';
>> cfg.coordsys = 'mni';
>>
>>
>> mask = ft_sourceinterpolate(cfg,stat,mri);
>> statplot.mask = mask.mask;
>>
>>
>> *and then for plotting*
>>
>>
>> cfg = [];
>> cfg.method = 'slice';
>> cfg.funparameter = 'stat';
>> cfg.maskparameter = 'mask';
>> cfg.funcolorlim = [-0.1 0.1];
>> cfg.opacitylim = [-0.1 0.1];
>> figure
>> ft_sourceplot(cfg, statplot);
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> * ===============================================*
>>
>>
>> *[image: Inline image 1]*
>> *Best Regards*
>>
>>
>> *Chaitanya Srinivas Lanka Wiss. Mitarbeiter
>> *
>>
>> *PhD Student Functional and Restorative Neurosurgery Neural Information
>> ProcessingNeurosurgical University Hospital*
>>
>> * Graduate Training Center for Neuroscience Eberhard Karls
>> University Eberhard Karls University **Otfried-Mueller-Str.45
>> Österbergstr. 3*
>> * D-72076 Tuebingen **D-72074
>> Tuebingen*
>>
>> *Mobile Phone Number : +49-176-79035731*
>> *===============================================*
>>
>> _______________________________________________
>> fieldtrip mailing list
>> fieldtrip at donders.ru.nl
>> http://mailman.science.ru.nl/mailman/listinfo/fieldtrip
>>
>
>
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