[Eeglablist] CSD maps in STUDY design

[Arnaud Delorme]

Dear Marco,

yes, this code is actually for power spectrum. 
For 3 conditions, loop on each condition

for cond = 1:3
	spec_cond = spec{cond}
	... % compute CSD and plot
end;

Best,

Arno

On 19 Jan 2013, at 03:07, Marco Montalto wrote:

> Dear Arno,
> 
> Thank you for your reply and for all the information you have supplied me with. I just have two questions:
> 
> 1) Can I use this code if I precompute measures in STUDY design for power spectrum?
> 
> 2) I have three conditions in STUDY design. How do I produce CSD maps for each condition?
> 
> Thanks once again and looking forward to your reply.
> 
> Regards,
> Marco
> 
> On 19 Jan 2013, at 02:59, Arnaud Delorme <arno at ucsd.edu> wrote:
> 
>> Dear Marco,
>> 
>> based on another email I sent earlier to the list.
>> 
>> % merge all channel location structures for the STUDY
>> mergelocs = eeg_mergelocs(ALLEEG.chanlocs);
>>  
>> % get ERSP results (scalp maps) - for example scalp topography of spectrum in the alpha band
>> [STUDY spec ] = std_specplot(STUDY,ALLEEG,'channels', { mergelocs.labels }, 'topofreq', [8 12]);
>> 
>> then you may use one of the many laplacian function eeg_laplac.m is a good one although you will have to rebuild a dataset to use it. Something like
>> 
>> TMP = EEG(1);
>> TMP.chanlocs = mergelocs;
>> TMP.data = squeeze(spec{1});
>> CSD = eeg_laplac(TMP, 1);
>> 
>> % plot average CSD scalp topography
>> average_CSD = mean(CSD,2); % average across subjects
>> figure; topoplot(average_CSD, mergelocs);
>> 
>> Best,
>> 
>> Arno
>> 
>> <Screen Shot 2013-01-18 at 17.58.30.png>
>> 
>> On 17 Jan 2013, at 13:56, Marco Montalto wrote:
>> 
>>> Dear List,
>>> 
>>> Is there a way of producing CSD (current source density) maps in EEGLAB, in a STUDY design?
>>> 
>>> Marco Montalto
>>> _______________________________________________
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> 

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