[Eeglablist] Information about different in ERP/ERSP

[Arnaud Delorme]

Dear Daniele,

Writing a script would make the most sense. Copy the history command for plotting STUDY

[~,erspdata, timevals, freqvals] = std_erspplot(STUDY, ALLEEG, 'channels', { 'FP1' 'FP2' });

erspdata =

  2×1 cell array

    {10×12×2×18 single}
    {10×12×2×18 single}

In my case, I have 10 frequency and 12 time points, 2 electrodes (FP1 and FP2) and 18 subjects. I also have 2 conditions since there are two elements in erspdata

Then you can do

erspdatadiff{1} = squeeze( erspdata{1}(:,:,2,:) - erspdata{1}(:,:,1,:) ); % FP2 minus FP1 condition 1
erspdatadiff{2} = squeeze( erspdata{2}(:,:,2,:) - erspdata{2}(:,:,1,:) ); % FP2 minus FP1 condition 2

And

std_stat(erspdatadiff); % to compare condition 1 and 2 for the difference between FP2 and FP1

Best wishes,

Arno

> On Jan 27, 2025, at 02:36, Daniele Lozzi via eeglablist <eeglablist at sccn.ucsd.edu> wrote:
> 
> Dear EEGlab community,
> 
> I  am using EEGlab to analyze my EEG data and I am encountering some
> difficulties in performing a comparison between the ERP and ERSP plots of
> different channels within the same experimental condition.
> 
> My goal is to analyze the differences in brain activity between, for
> example, the Fp1 channel and the Fp2 channel during the presentation of a
> stimulus. Unfortunately, from the software's GUI, I have only been able to
> find the way to compare the same channels in different conditions, but not
> the way to compare different channels in the same condition.
> Could you please tell me how I can perform this type of analysis?
> 
> Is it possible that I am missing some functionality of the software, or is
> it necessary to use specific scripts or procedures?
> 
> Thank you in advance for your support and attention.
> 
> Sincerely,
> 
> Daniele Lozzi
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