[Eeglablist] Artifacts

[Elisa Visani]

Dear all,
I 've just started to use ICA analysis to remove artifacts from the EEG traces.
I have two questions:
1- Is it correct to analyze only few (8-15) seconds and then remove artifactual components from whole trace (700-1000 sec)?
2- Can I use ICA analysis repetitevely on the same trace? (I saved filtered EEG, but sometimes I had to filtered the filtered EEG to obtain a good trace) 
Thank you.
Elisa Visani 
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