[Eeglablist] ERSP condition differences at the group level

[Arnaud Delorme]

Dear Burcu,

you are probably already using scripts as none of the STUDY function can currently plot differences between conditions. So in your script, you may simply invert the order of A and B and that should do the trick.

Arno

On 20 Feb 2013, at 16:53, Makoto Miyakoshi wrote:

> Dear Burcu,
> 
> If you don't mind doing a little hack here is description of how to do it. Here I show you the case of ICA-based clustering, not channel, but they should be more or less the same I guess (I hope).
> 
> 1. Plot 'Edit/plot clusters.'
> 2. Show all ERSPs.
> 3. Close it by pressing 'ok'. This updates your STUDY.
> 4. You should be able to find STUDY.cluster(1,x).icaersp which is a cell that contains group x condition data (each of them have the size of frequency x timepoint).
> 5. You select pick them up to calculate subtraction. You can also find frequency and time scales there.
> 6. FYI to plot time-frequency plot use 'imagesc(); axis xy'.
> 
> Sorry I can't provide exactly matched information. If you find this method does not help much let me know.
> 
> Makoto 
> 
> 2013/2/20 Burcu Ayşen Ürgen <burgen at cogsci.ucsd.edu>
> Hi all,
> 
> Is there a way to change the direction of the comparison when plotting the ERSPs at the group level (using STUDY structure) without precomputing again? For instance, I want to look at the difference in ERSPs for (Condition A - Condition B) and I precomput the channel measures specifying the Condition A as the first variable and Condition B as the second variable. The difference plot naturally gives the (Condition A-Condition B) difference. If I want to see the (Condition B-Condition A) difference, should I precompute the channel measures by specifying the Condition B as the first variable and Condition A as the second variable OR is there a way to turn the difference direction without doing the precomputation?
> 
> Thanks,
> 
> Burcu Aysen Urgen
> 
> -- 
> Burcu Aysen Urgen, PhD candidate
> Department of Cognitive Science
> University of California, San Diego
> 
> Email: burgen at cogsci.ucsd.edu
> 
> 
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> 
> -- 
> Makoto Miyakoshi
> JSPS Postdoctral Fellow for Research Abroad
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego
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