[Eeglablist] relationship between no of channels and no of components

[Indir Jaganjac]

Prof.Piotr Jaskowski,
 
 
 
 
 
 
 
 

There is probably some redundancy in your data, so runica() does PCA automatically,
in order to reduce dimensionality.
 
 
 

If you want to retain all 32 channels, you can do this: 
 
After choosing Tools > Run ICA, this pop-up window comes up: RUN ICA decomposition -- pop_runica(). Type 'pca',32 in commandline options box (instead of 'extended',1).
 
 
 
 
 
 
 
regards,

I. Jaganjac
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

From: "Piotr Jaskowski" <jaskowski at vizja.pl>
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Subject: [Eeglablist] relationship between no of channels and no of components
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Dear All,
               I run ICA with 32-channel segmented data. I expected to get
32 ICA components. In fact, I've got only 22 components and a following
message:
 
Input data size [22,51775] = 22 channels, 51775 frames/nAfter PCA dimension
reduction,
  finding 22 ICA components using extended ICA.
 
Could anybody explain me where the remaining 10 components disappeared?  
 
Best regards,
Piotr
---------------------------------------------------
Prof. Piotr Jaskowski, Ph.D.
Department of Cognitive Psychology
University of Finance and Management
Pawia 55, 01-030 Warszawa, Poland
http://cogn.vizja.pl
 



 


      
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