[Eeglablist] scale for component averages plots

[Makoto Miyakoshi]

Dear Scott and Mirek,

My understanding is that the unit, microV, can be used because ICA
does not do any rescaling. However, real source activity must be much
larger than microV scale. So something must be wrong in my
understanding. Please tell me where I'm making a mistake.

Also, I found the EEGLAB option has 'Scale ICA activities to RMS'...
what does this do? Default is on.

Makoto


2012/10/11 mirek <3mirek at gmail.com>:
> Hi All,
>
> After ICA decomposition and ICs clustering there's a possibility to plot
> the ERPs of the clusters ('Plot component measures'). The plots have µV
> on the vertical axis, but I wonder what, in fact, µV mean in this
> context? For usual channel ERP averages we have just averaged voltage
> measured by particular electrode. In case of clusters, the plots show
> only reconstructed averaged activity of the deep cluster centroid. So
> how can I treat these units? As a relative rather than real ones?
>
> Mirek Wyczesany
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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