[Eeglablist] ICA clustering

[Adam Grinberg]

Hi,
I am interested in performing source reconstruction on independent components.

I have epoched data of ERP experiment, with two conditions (Both conditions are on the same dataset). I already ran ICA on each dataset (i.e., each participant) and now wish to create an EEGLAB study for all participants. I first tried to create a study and add "code" as an independent variable in the study design, to differentiate between the trials. EEGLAB just ignores this, it seems... The result is that the PCA clustering is performed on all trials regardless of condition. Not very useful.

Another option is to divide the datasets into two, a separate dataset for each condition. This is actually a requirement when creating a "simple ERP STUDY".
Alternatively, I can create one study for each condition.

However, when I separate the conditions into two datasets, the ICA weights from the original dataset are retained. Therefore, when I cluster the components, the plots look the same for both conditions. Does anyone have any insights? How can I solve this problem?

Thank you in advance.

/Adam
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Adam Grinberg, PT, PhD
Department of Community Medicine and Rehabilitation, Physiotherapy
Umeå University
Umeå, Sweden
Tel: +46 (0) 90 786 96 30