[FieldTrip] ICA - Can I visualize Activity power spectrum of single components?

[KatrinH Heimann]

Wonderfull! Thanks Diego!!!!
Cheers k


2014-05-28 14:24 GMT+02:00 Lozano Soldevilla, D. (Diego) <
d.lozanosoldevilla at fcdonders.ru.nl>:

> Hi Katrin,
>
> First, to display the independent components:
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> cfg = [];
> cfg.layout = 'CTF151.lay'; % specify the layout file that should be used
> for plotting
> cfg.viewmode = 'component'
> ft_databrowser(cfg, comp)
>
> Take a look to the following example script:
>
> http://fieldtrip.fcdonders.nl/example/use_independent_component_analysis_ica_to_remove_eog_artifacts
>
> Second, you'll have to compute the power spectrum for each independent
> component with ft_freqanalaysis:
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> cfg              = [];
> cfg.output       = 'pow';
> cfg.channel      = 'all';%compute the power spectrum in all ICs
> cfg.method       = 'mtmfft';
> cfg.taper        = 'hanning';
> cfg.foi          = 2:2:30;
> freq = ft_freqanalysis(cfg, comp);
>
> And you can plot the spectra:
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> nsubplots = 25;
> nbyn = sqrt(nsubplots);% sqrt(nsubplots) should not contain decimals, type
> doc subplot
>
> Nfigs = ceil(size(comp.topo,1)/nsubplots);
> tot = Nfigs*nsubplots;
>
> rptvect = 1:size(comp.topo,1);
> rptvect = padarray(rptvect, [0 tot-size(comp.topo,1)], 0,'post');
> rptvect = reshape(rptvect,nsubplots,Nfigs)';
>
> for r=1:size(rptvect,1);
>   figure;set(gcf,'units','normalized','outerposition',[0 0 1 1]);%full
> screen
>   k=0;
>   for j=1:size(rptvect,2);
>     if~(rptvect(r,j)==0);
>       k=k+1;
>       cfg=[];
>       cfg.channel = rptvect(r,j);
>       subplot(nbyn,nbyn,k);ft_singleplotER(cfg,freq);
>     end
>   end
> end
>
> For the IC topos you'll follow the same logic as above but with:
>
> figure
> cfg = [];
> cfg.component = [1:20];       % specify the component(s) that should be
> plotted
> cfg.layout    = 'GSN-HydroCel-129.sfp';
> cfg.comment   = 'no';
> ft_topoplotIC(cfg, comp)
>
> I hope it helps
>
> Diego
> ------------------------------
>
> *From: *"KatrinH Heimann" <katrinheimann at gmail.com>
> *To: *"FieldTrip discussion list" <fieldtrip at science.ru.nl>
> *Sent: *Wednesday, 28 May, 2014 12:59:38 PM
> *Subject: *[FieldTrip] ICA - Can I visualize Activity power spectrum of
> single        components?
>
>
> Dear all,
> another question:
> Is it possible to visualize the Activity power spectrum of the single
> components after an ICA by using ft_databrowser (or something else). I like
> this feature from EEG lab as I find it easier to detect artifactual
> components.
> Thanks a lot for your help
> Katrin
>
>
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> fieldtrip at donders.ru.nl
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>
>
>
>
> --
> PhD Student
> Neuronal Oscillations Group
> Donders Institute for Brain, Cognition and Behaviour
> Centre for Cognitive Neuroimaging
> Radboud University Nijmegen
> NL-6525 EN Nijmegen
> The Netherlands
> http://www.ru.nl/people/donders/lozano-soldevilla-d/
>
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