[Eeglablist] CSD maps.

[Christopher Summerfield]

thanks arno.
strange thing is, the code below plots a CSD map that looks exactly like
the inverse of my scalp map.  multiplying the CSD values by -1 makes it
look fine. am I doing something wrong, or is there a problem with the
code?

>
> Th = cell2mat({ EEG.chanlocs.theta })*pi/180;
> Rd = cell2mat({ EEG.chanlocs.radius });
> [x y] = pol2cart(Th, Rd);
> figure; topoplot(del2map(EEG.icawinv(:,1), x+j*y), EEG.chanlocs);

thanks again -
chris




> Arno
>
> ps: I modified del2map so, in future EEGLAB releases, you will be able
> to type directly
>
> figure; topoplot(del2map(EEG.icawinv(:,1),EEG.chanlocs), EEG.chanlocs);
>
> Christopher Summerfield wrote:
>
> >hi Arno,
> >
> >looking at the code for topoplot() and headplot() it seems that there's no
> >option to plot a CSD (current source density) map.  I guess that what's
> >involved is taking the 2nd
> >derivative across the interpolated scalp data...in 2 dimensions?  do you
> >have code to do this, or can you suggest how I might do it?
> >thanks
> >chris
> >
> >
> >Christopher Summerfield
> >summerfd at psych.columbia.edu
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>
>
> --
>
> *Arnaud Delorme, Ph.D.*
> Computational Neurobiology Lab, Salk Institute
> 10010 North Torrey Pines Road
> La Jolla, CA 92037 USA
>
> *Tel* : /(+1)-858-458-1927 ext 15/
> *Fax* : /(+1)-858-458-1847/
> *Web page *: www.sccn.ucsd.edu/~arno <http://www.sccn.ucsd.edu/%7Earno>
>
>