[Eeglablist] Moving ICA info to a different data set

[Mikołaj Magnuski]

Hey Becky,

1. The order does matter. Removing components actually removes the signal
that these components contribute. You certainly want to remove the
artifactual ICs in your target dataset because you want to remove the
artifactual signal that they contribute to your data of interest.

2. It should be enough if you modify EEG.icachansind appropriately.
EEG.icachansind tells EEGlab which channels of your dataset participate in
the ICs.
For example if your 'ICA-giving' dataset consists of channels A, B, D and F
but the target data has all A, B, C, D, E and F you set EEG.icachansind in
the target dataset to be [1, 2, 4, 6] because if you take out channels with
these indices from your target dataset you get the channels present in the
ICA-giving one.
I'll be happy to clarify this more if my description is vague.
2 gru 2013 22:27 "Becky Prince" <becky.prince at york.ac.uk> napisał(a):

> Dear EEGLAB users,
>
> I ran ICA on clean, epoched subsets of my individual data sets with the
> goal of using the ICA decomposition from each subject on their larger
> continuous data set.  So for each subject, I have a cleaned, epoched,
> smaller EEG set with ICA (EEG1) and a larger, continuous EEG set without
> ICA (EEG2). Now I'd like to copy each subject's ICA info from EEG1 into
> EEG2, and continue analysis on the EEG2 data sets for each subject.
>
> I have a few questions:
>
> 1. Should I reject the artifactual ICs before or after copying the ICA
> fields into the EEG2 data set?  Does the order of these steps matter?
>
> 2. If there are fewer channels in EEG1 (set with ICA), should I reject the
> same channels in EEG2 before copying the ICA fields into the EEG2 data
> structure?  Again, does the order of these steps matter?
>
> BTW I have been reading the previous posts about rejected/interpolated
> channels and ICA, so I'm somewhat familiar with the issues running ICA on
> only the 'good' channels.
>
> Thanks!
> Becky
> ____________________________________________
>
> Becky Gilbert (nee Prince)
> PhD Researcher
>
> http://www.york.ac.uk/psychology/staff/postgrads/becky.gilbert/
> Office B213
> Lab C120
> Department of Psychology
> University of York
> Heslington, York, YO10 5DD, UK
>
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