[Eeglablist] ICA Component Plots and the meaning of the axes

[Edward Justin Modestino, M.Phil.]

Hello Arno and list,
I have two questions with a pending deadline looming.  So, I need to know
this information as soon as possible.

(1)
I have a 3D plot of a component from ICA in EEGLAB.  The ICA component
also came with an intensity plot.  I need to know the meaning of the data
on the X and Y axes of the intensity plot.  What do these scales mean? 
What are they referring to?  I assume the warmer/red the color this means
the component is more correlated with the area.

Can one export these values of intensity from the 3D plots to find which
channels (electrodes) that fall within specific values, something like a
thresholding to create a region of interest quantitatively vs. merely
visually?

(2)
Is there a specific ordering to the ICA components?  Can we find out the
percentage that specific components from the ICA contribute to the signal?
 I realize this sounds like I am asking a PCA question about ICA, but this
was asked of me by my advisor.  So, I am sure it is a good question.  Is
there a simple way to find this out of each component?

Thanks,
Ed Modestino
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Edward Justin Modestino, M.Phil.
Ph.D. Candidate in Complex Systems and Brain Sciences
Cognitive Neurodynamics Laboratory
Center for Complex Systems and Brain Sciences
Florida Atlantic University
(561) 297-2238
Fax: (561) 297-3634
modestino at ccs.fau.edu
http://www.ccs.fau.edu/~modestino/
Lab: http://www.ccs.fau.edu/~bressler/CNL_CCSBS/CNL_CCSBS_FAU.html
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