[Eeglablist] Component spectra and maps question

[Makoto Miyakoshi]

Dear Ida and Arno,

>what is the interpretation of components obtained in 1st and 2nd setup.

Your 1st setup is to see the largest contributor at specific frequency
compared to whole channel variance, and your 2nd setup is to see the
largest contributor at specific frequency compared to the specific channel.

>In my case, components obtained in 2nd and 3rd step in some cases are
identical and in some 4 of 5 are the same.

I was unable to find what '[Unchecked] (data-comp) spectra' does.
Arno, would you please help us understand it?

Makoto


2013/8/13 ida miokovic <ida.miokovic at gmail.com>

> Dear List,
>
> I have been plotting "Component spectra and maps" in EEGLAB of an
> independent components (after ICA procedure) and having some dilemmas
> regarding the components obtained as largest contributing ones.
>
> 1st setup in the pop-up window (Plot-->Component spectra and maps") - in
> text box "Electrode number to analyze" I put 0 in order to get the whole
> scalp analyzed. And "Compute comp spectra" was checked. In Matlab command
> window, percent relative variance is obtained.
>
> 2nd setup in the pop-up window - in "Electrode number to analyze" I put []
> in order to get the electrode with the max power at the frequency of my
> interest. "Compute comp spectra" was checked. In Matlab command window,
> percent relative variance is obtained.
>
> 3rd setup in pop-up window - in "Electrode number to analyze" I put "the
> number of electrode obtained in 2nd setup" in order to get the components
> accounts to this electrode at the frequency of interest. "Compute comp
> spectra" was *unchecked*. In Matlab command window, percent variance
> accounted for is obtained.
>
> I went through tutorial and understand that 3rd setup gives results as
> components accounts to the electrode at the frequency of interest. But now
> I am confused with what is the interpretation of components obtained in 1st
> and 2nd setup. In my case, components obtained in 2nd and 3rd step in some
> cases are identical and in some 4 of 5 are the same.
>
> Thank you in advance for any help,
>
> Kind regards
>
> Ida
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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