[Eeglablist] continuous data

Philip Michael Zeman pzeman at alumni.uvic.ca
Wed Apr 6 10:42:40 PDT 2005


You can do ICA on the unsegmented data. One of the functions called by
pop_runica concatenates all 'trials' or 'segmented epochs' before doing ICA.
You should get the same components whether you are concatentating previously
segmented data or you are running it on continuous data.

Viewing the ICA sources (EEG.icaact) is a difference story.  If your data is
really noisy it will be harder to see anything in the continuous data than
if you segment your data and then ensemble average it.  (This can be done
after running ICA on the continuous data if you wish.)

Enjoy!


~Philip Zeman





----- Original Message ----- 
From: "Kline, Keith A" <Keith.Kline at uth.tmc.edu>
To: <Eeglablist at sccn.ucsd.edu>
Sent: Wednesday, April 06, 2005 9:35 AM
Subject: [Eeglablist] continuous data


> I have data from a continuous 20 minute EEG session.  Would it be
inappropriate to apply ICA to the full session (after cleaning it up, of
course), or must I segment into epochs before doing ICA?
> Thanks,
> -Keith K.
>
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