[Eeglablist] topomap back view

[Arnaud Delorme]

Dear Bjoern,

yes, there is no back view like there is in Brainvision for instance, if this what you mean. However, this should not be too hard to implement given that the topoplot function performs spherical interpolation. If anyone comes up with such a function, let us know and we will integrate it. Ideally this should be implemented in topoplot itself as an additional option.

Best,

Arno

On Aug 28, 2011, at 6:46 PM, Niko Busch wrote:

> Hi Bjoern,
> 
> I am not sure what you mean by 'back/front'. If you want a simple 2D topoplot, this is how I do it. I assume that you have already loaded your two conditions in the eeglab GUI. Alternatively, replace 'ALLEEG' with the names of the variables holding your two EEG sets. The code is a bit verbose for the sake of clarity. Of course, the code could be more compact. 
> 
> Cheers,
> Niko
> 
> PS: I sent this message to your email addresses before, but the emails bounced back.
> 
> %-------------------------------------
> % Average over a time window, specified in SECONDs. Convert the time to
> % sampling points.
> win_start = 0.100;
> win_end  = 0.300;
> tlim = round(eeg_lat2point( [win_start win_end], 1, ALLEEG(1).srate, [ALLEEG(1).xmin ALLEEG(1).xmax]));    
> 
> % Average data over trials, then subtract the two conditions to get the
> % effect. Finally, average the effect over your time window of interest.
> data1 = mean(ALLEEG(1).data,3);
> data2 = mean(ALLEEG(2).data,3);
> effect = data2 - data1;
> 
> winmean = mean(effect(:,tlim(1):tlim(2)),2);
> 
> % Plot the figure. Modify the topoplot options as you see fit.
> figure;
> topoplot(winmean, ALLEEG(1).chanlocs); 
> %-------------------------------------_______________________________________________
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