[Eeglablist] ERSP using baseline from a different condition

[Makoto Miyakoshi]

Dear Nikola,

This requires manual file operation outside EEGLAB.
When you precompute ersp, EEGLAB generates design1_xxxxxx.icaersp. You can
open them by 'load disign1_xxxxxx.icaersp -mat' and can find baseline
values. Sorry this is only minimum information for the solution.

Makoto


2013/5/2 Nikola Vukovic <vukovicnikola at gmail.com>

> Dear EEGlab community,
>
> I am a beginner EEGlab user, and have a problem which was brought up a
> couple of times before on the list, but for which I wasn't able to find a
> clear solution.
>
> I'm working with a STUDY design, which contains datasets decomposed using
> ICA, and their various components already clustered. I would like to find a
> way to calculate ERSPs for a cluster where the baseline for my experimental
> conditions of interest is taken from a separate condition (the "reference"
> condition).
>
> So far, looking at the mailing list archives, I've been able to gather
> that one can use the powbase variable to specify a baseline derived from
> some other condition. However, all the posts I found also report issues
> with being unable to get the format of the powbase matrix right, or
> otherwise getting Matlab errors with their customized script.
>
> I would be extremely grateful to anyone who can provide hints or scripts
> which would help me solve this issue. Saying that I'm inexperienced with
> eeglab coding would probably be the understatement of the year, but I am
> willing to follow any leads as to how to proceed. I presume there must be a
> way to calculate ERSP for a component cluster, selecting only my reference
> condition in the Study design, and then from this somehow extract the
> baseline values which could be used for calculating ERSP in other
> conditions?
>
> Best wishes,
> Nikola
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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