[FieldTrip] ICA problem

[Sheraz Khan]

Hi Sylvana,

Is the data SSS (maxfilter), I normally have this problem when data is SSS,
try doing ICA with PCA (set at 64 components).

Sheraz Khan
Martinos Center
Boston, USA

On Wed, Jul 6, 2011 at 2:09 PM, Stephen Whitmarsh <
stephen.whitmarsh at gmail.com> wrote:

> Dear Sylvana,
>
> >From the top op my head: When running the ICA, try only computing it
> for the MEG or EEG channels. (cfg.channel = 'MEG';), so it doesn't run
> on reference sensors in case of MEG.
> I have hunch that might help out.
>
> Cheers,
> Stephen
>
>
> On 6 July 2011 19:37, Sylvana <sylvana.schister at utah.edu> wrote:
> > Hi all,
> >
> > I am trying to use ICA to clean EOG and ECG artifacts of neuromag data.
> > I am running ft_topoplotIC(cfg, comp), where 'comp' is the output of
> > ft_componentanalysis.
> >
> > I get the following error message:
> >
> >
> > ??? Error using ==> surf at 74
> > X, Y, Z, and C cannot be complex.
> >
> > Error in ==> ft_plot_topo at 184
> >  h = surf(Xi-deltax/2,Yi-deltay/2,zeros(size(Zi)), Zi, 'EdgeColor',
> > 'none', 'FaceColor', shading);
> >
> > Error in ==> ft_topoplotER at 753
> > ft_plot_topo(chanX,chanY,datavector,'interpmethod',cfg.interpolation,...
> >
> > Error in ==> ft_topoplotIC at 116
> >    ft_topoplotER(cfg, varargin{:});
> >
> >
> > The complex variable is 'Zi', which is taken from 'comp'. I can modify
> > the function to take the real part of the variable (or the absolute
> > value), but I am not sure if this would be the correct thing to do. In
> > case this is a bug, I thought I should report it. Any comments?
> >
> > Thanks for your help,
> >
> > Sylvana Schister
> > Univ. of Utah
> > Dept. of Bioengineering
> >
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> > fieldtrip at donders.ru.nl
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> >
>
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