[Eeglablist] Selecting multiple electrodes for comparison with a study design

[Stephen Politzer-Ahles]

Hi Christina,

I have not worked with STUDY or with ERSPs, but when I group electrodes in
ERP analysis what I usually do is just write the mean amplitudes for all
electrodes to an Excel sheet (using MATLAB's mean() and xlswrite()
functions), average the electrode groups in Excel using the =average()
function, and then put those group averages into an ANOVA.

Best,
Steve Politzer-Ahles

On Fri, Apr 20, 2012 at 3:16 AM, Christina Lavallee <lavallee29 at gmail.com>wrote:

> Dear List,
> I have created a study design in which I would like to compare two
> conditions of interest. I have looked at ERSP plots of each condition and
> then discerned the significant differences by calculating the permutation
> with fdr. Since I have specific hypothesis about regions of interest, I
> would like to select multiple electrodes at a time to compare across for
> conditions. For example, right now I am only making the comparison for a
> single electrode. I'd like to cluster the electrodes across conditions for
> my next comparisons (i.e. somehow take the average of F6, F8 and compare
> across conditions); however, it seems as though when I select multiple
> electrodes in the GUI I only get the ersp plots for each electrode and no
> comparison between conditions. Ideally, I would like to group certain sets
> of electrodes and compare them across my two conditions. Can anyone please
> tell me if this is possible in the GUI or would anyone be able to give an
> idea or snippet of code that would enable me to do this?
>
> Thanks,
> Christina
>
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-- 
Stephen Politzer-Ahles
University of Kansas
Linguistics Department
http://www.linguistics.ku.edu/
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