[FieldTrip] ICA for merged EEG recordings

Maarten De Vos maarten.de.vos at uni-oldenburg.de
Wed May 16 11:08:00 CEST 2012

dear Roni,

I would definitely suggest to run ICA on separate blocks.  Because you removed the cap, also the relative position of eyes to the electrodes can have (has) been changed.  Seems you have enough data in both sessions to run a reliable ICA.
so I would run ICA on separate blocks, remove artifacts, and then merge the data.
Van: fieldtrip-bounces at donders.ru.nl [fieldtrip-bounces at donders.ru.nl] namens Roni Tibon [ronitibon at gmail.com]
Verzonden: woensdag 16 mei 2012 9:54
Aan: Email discussion list for the FieldTrip project
Onderwerp: [FieldTrip] ICA for merged EEG recordings

Hi all,

I have a question which is not directly related to fieldtrip, but I bet you can help me with that :)

I'm running a very long EEG experiment (takes about 3 hours), so we decided to run it in two sessions, in two following days.
I used the Biosemi Merger to merge the files from day 1 and day 2, and want to run ICA to remove blinks and eye-movements.

Would you say it's better to run ICA on the merged file, or do you think it would be best to run ICA separately for each file, and then merge the data?


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