source analysis example images

Brian Roach Brian.Roach at YALE.EDU
Thu Apr 19 21:51:38 CEST 2007

fieldTrip users,

I've run a source analysis using the DICS method and EEG data.  Here is the
code the leads me to the attached sourceplot results:

cfg.output     = 'powandcsd';
cfg.method     = 'mtmfft';
cfg.tapsmofrq  = 2;
cfg.foilim     = [80 81];
freq = freqanalysis(cfg, data);
cfg.method = 'dics';
cfg.frequency = 80;
cfg.hdmfile = '/home/bjr39/FTsource/vol.mat';
cfg.resolution = 2;
cfg.projectnoise= 'yes';
tic;source = sourceanalysis(cfg, freq);toc
cfg.mriunits = 'mm';
cfg.sourceunits = 'mm';
cfg.funparameter  = 'nai';
sourceD = sourcedescriptives([], source);
mriFile = '/home/bjr39/FTsource/t1_icbm_normal_1mm_pn0_rf0.mnc';
tic; sourceF = source2full(sourceD); toc
tic; sourceInterp = sourceinterpolate(cfg, sourceF, mriFile); toc
sourceplot(cfg, sourceInterp)

I am wondering if this type of result seems reasonable (if it looks as
though I have not made any huge mistakes)?  If so, I would run another
condition for the same subject and try to use the statistics functions.

Also, what does this color scale describe?  What are its units?

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