[Eeglablist] basic question

Arnaud Delorme arno at ucsd.edu
Mon Jun 21 07:05:31 PDT 2010


Dear Daniele,

this is correct. ICA should be run using the concatenated data from both conditions. The reason is that otherwise it is going to be harder to compare the ICA components in the two conditions or remove the ICA artifacts in the two conditions (if you run ICA on each dataset separately, someone may always argue that the difference you observe between the two conditions arises because you have selected or removed different ICA components in each condition).

Hope this helps,

Arno

On Jun 19, 2010, at 1:32 AM, d.arisi at ospedale.cremona.it wrote:

> I need to run ICA on epoched EEGs of different subjects
> In each subject 2 different visual stimuli were presented, in random
> order, during the same EEG session (named "condition 1" and "condition
> 2"); epochs corresponding to each type of condition were grouped (off
> line) in 2 datasets for each subject
>> From EEGLAB tutorial I understand that a correct ICA decomposition must be
> done concatenating all epochs ("condition 1" and "condition 2") for each
> subjects and not running ICA on every separated dataset
> Am I right? some suggestion?
> 
> regards
> Daniele Arisi
> 
> 
> 
> 
> 
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