[Eeglablist] ICA topographies

[Arnaud Delorme]

Dear Erika,

this is a good question. The scalp topographies of the components showed in pop_spectopo are topographies depicting power (squared version of the component topographies in the time domain -- such as in topoplot and pop_prop). The topographies in topoplot and pop_prop should be the same though. The component topographies showed in envtopo can have their polarity inverted based on the polarity of their ERP when compared to topoplot and pop_prop. You might want to look at the EEGLAB tutorial for more details.

Best regards,

A. Delorme

On Apr 30, 2012, at 2:12 PM, Erika Nyhus wrote:

> I am trying to choose ICA components for further analysis.  First, I use pop_topoplot to see all components.  Second, I use pop_spectopo to look at which components contribute to the  times, frequency band, and channels I am interested in.  Finally, I use pop_prop to see the component properties of the component I chose based on the previous step.  The figures from each of these steps show different topographies for the same component.  What are the units for each of these plots? 
> 
> -- 
> Erika Nyhus, Ph.D.
> Cognitive, Linguistic, and Psychological Sciences
> Brown University 
> 190 Thayer St.
> Providence, RI 02912-1821
> 
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