interpolated source activity values = NaN

[Ingrid Nieuwenhuis]

Hi Frederic,



Probably the NaN's are the voxels outside the brain. The source estimate is
only performed for voxels inside the brain, the voxels outside are put to
NaN. In the field "inside" it is coded which voxels lay inside the brain.
Try:

SourceInterpolatedStats.stat(SourceInterpolatedStats.inside)

This should give you the non-NaN values.



Hope this helps,

Ingrid





  _____

From: FieldTrip discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf
Of Frederic Roux
Sent: Friday, December 04, 2009 12:51 PM
To: FIELDTRIP at NIC.SURFNET.NL
Subject: [FIELDTRIP] interpolated source activity values = NaN



Hi everyone,

I would like to use the values that correspond to the interpolated
statistics at source level.
The problem is that most of these values are NaNs, even tough I can
visualize them with sourceplot.

Here are the steps I am doing to compute these values:

[signal1] = sourcegrandaverage(cfg,data);
[signal2] = sourcegrandaverage(cfg,data);

[Stats] = sourcestatistics(cfg,signal1,signal2);%the statistics used here is
depsamplesT using fdr and clusterstatistics = maxsum
[SourceInterpolatedSats] = sourceinterpolate(cfg,Stats,template_mri);

This yields:

SourceInterpolatedSats =

       inside: [91x109x91 logical]
         stat: [91x109x91 double]
          dim: [91 109 91]
    transform: [4x4 double]
      anatomy: [91x109x91 double]
          cfg: [1x1 struct]

But when I try :

SourceInterpolatedStats.stat([20 45 68]) = NaN.
And this holds true for almost any index.

Does anyone know if it's possible to access these values?

Frederic

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The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/neuroimaging/fieldtrip.
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