interpolated source activity values = NaN

[Frederic Roux]

Actually I don't think so.

I first computed the sourcestatistics.
Then I interpolated the Stats and visualized them with sourceplot and cfg.interactive = yes.

Frederic




Date: Fri, 4 Dec 2009 14:58:23 +0100
From: ingrid.nieuwenhuis at FCDONDERS.RU.NL
Subject: Re: [FIELDTRIP] interpolated source activity values = NaN
To: FIELDTRIP at NIC.SURFNET.NL























Dear Frederic,

 

Could it be that you wrote down the
indices of the voxels before interpolating? Since the voxels before
interpolating do not match anymore after interpolating onto the template_mri.

 

Best,

Ingrid

 

 









From: FieldTrip
discussion list [mailto:FIELDTRIP at NIC.SURFNET.NL] On Behalf Of Frederic Roux

Sent: Friday, December 04, 2009
2:51 PM

To: FIELDTRIP at NIC.SURFNET.NL

Subject: Re: [FIELDTRIP]
interpolated source activity values = NaN



 

Hi Ingrid,



thanks for the quick reply. I will try your suggestion but I am pretty much
sure that the values I want to look at are inside the brain.



My approach is the following:



I want to indentify the voxels that show significant activation.

So first I visualized my data with sourceplot and cfg.interactive = 'yes' and
then I write down the indices of the voxels onto which I click.



When I feed these indices into SourceInterpolatedStats.stat([x y z]) this
returns me NaNs, even tough the voxel was clearly located inside the brain.



Do you have any idea of why this happens?



Frederic







Date: Fri, 4 Dec 2009 13:21:17
+0100

From: ingrid.nieuwenhuis at FCDONDERS.RU.NL

Subject: Re: [FIELDTRIP] interpolated source activity values = NaN

To: FIELDTRIP at NIC.SURFNET.NL



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







Alle E-Mail-Adressen online auf einen Blick Ich will Hotmail!



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The aim of this list is to facilitate the discussion between users of the
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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.

  http://listserv.surfnet.nl/archives/fieldtrip.html

  http://www.ru.nl/fcdonders/fieldtrip/

----------------------------------

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.

  http://listserv.surfnet.nl/archives/fieldtrip.html

  http://www.ru.nl/fcdonders/fieldtrip/
 		 	   		  
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Nie mehr um Weihnachtsgrüße verlegen: mit tollen Weihnachts-E-Mails 
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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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