[FieldTrip] ft_sourceplot on surface

[Azeez Adebimpe]

it would be nice if you can post the pics
that would give much much info

On Mon, Feb 29, 2016 at 4:18 PM, <nwolpert at uni-osnabrueck.de> wrote:

> Dear fieldtrip users,
>
> I have an issue when visualizing beamformed data: When using
> 'ft_sourceplot' to show the interpolated data on slices in the three
> planes (cfg.method = 'ortho'), reasonable results are produced. However,
> when doing surface plots by calling cfg.method = 'surface', the power is
> projected only to a subset of the brain, with very abrupt borders and zero
> power everywhere else. It gives the impression that there is some kind of
> scaling problem (i.e. the surface template used has the wrong scale), but
> I can't figure out the cause for this problem.
>
> I would be glad if anyone has a possible explanation. I attach the code
> below that produced the figures.
>
> Best,
> Nicolai Wolpert
>
> cfg              = [];
> cfg.method       = 'dics';
> cfg.grid         = grid;
> cfg.headmodel    = headmodel;
> cfg.dics.projectnoise = 'yes';
> cfg.dics.lambda       = 0;
> sourceAlpha_dics = ft_sourceanalysis(cfg, freq_alpha);
>
> % remove center of head bias by using the neural activity index (NAI)
> sourceAlpha_dics.avg.pow = sourceAlpha_dics.avg.pow ./
> sourceAlpha_dics.avg.noise;
>
> % reslice mri
> mri_real_resliced = ft_volumereslice([], mri_real);
>
> % Interpolation: Project computed sources on aligned template MRI brain
> cfg            = [];
> cfg.downsample = 2;
> cfg.parameter = 'avg.pow';
> sourceAlpha_dics_intp  = ft_sourceinterpolate(cfg, sourceAlpha_dics ,
> mri_real_resliced);
>
> % visualize the result
> cfg              = [];
> cfg.method       = 'surface';
> cfg.funparameter = 'avg.pow';
> ft_sourceplot(cfg, sourceAlpha_dics_intp);
>
>
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>
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