[Eeglablist] ICA topographies
arno at ucsd.edu
Thu Jul 5 22:33:15 PDT 2012
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.
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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