[Eeglablist] A second ICA after removing components?
Maximilien Chaumon
maximilien.chaumon at gmail.com
Mon Aug 15 09:09:18 PDT 2011
Hello all,
I'm currently cleaning data before working with components.
- I cut my dataset into epochs
- reject epochs where signal is bad
- run an ICA
- find blink and muscle components, reject them
- run an ICA again, and look at my components.
... as I understood was suggested at the bottom of this page
http://sccn.ucsd.edu/wiki/Chapter_01:_Rejecting_Artifacts
Then the ICs look very nice but come in pairs of extremely similar
topographies with different time courses, as shown on this
picture<http://oszilla.hgs.hu-berlin.de/public/2ICAs.png>
.
I am wondering what happened here. I can imagine that rejecting components
before running the second ICA is what went wrong... But why did I read that
on the wiki?
Thanks a lot for any advice.
Max
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