[Eeglablist] effect of deleting ICs parts in time domain

ida miokovic ida.miokovic at gmail.com
Sat Jul 13 09:54:08 PDT 2013


Dear List,

after performing ICA decomposition I realized that first 30 seconds of all
calculated ICs are probably artifacts (I did not perform manual rejection
of bad eeg data portions since I am not a medical student and I was afraid
to remove useful part of the data) because there are periodic shapes
appearing in all components time domain that look like movements now.

Then I looked into eeg data and realize that same happens with that data
set.

I am now wondering if I manually delete certain part of all calculated
independent components (by selecting for example time period 0 - 30 secs
and press REJECT button) from their time domain - are those brain
activations going to be deleted from the eeg dataset and are those first 30
seconds of ICs related with first 30 seconds of eeg data?

I tried to explain it clearly and I hope you can understand my doubts. What
also might be important for you to know that my data is not epoched for
certain reasons related with tasks nature.

If that is what happens, is there a way to remove part of ICs (all of them)
or EEG data by code and not by eeglab form?
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