[Eeglablist] Must reference channel be removed prior to ICA?

[Makoto Miyakoshi]

Dear Kornelia,

If biosemi, you must re-reference to something, which reduces the rank by 1
so you should fit the rank either by discarding one any channel
(recommended) or use pca option to reduce the rank. See the following to
find what would happen if you don't do it.
http://sccn.ucsd.edu/wiki/Makoto%27s_preprocessing_pipeline

Makoto

On Tue, Dec 30, 2014 at 7:57 AM, Kornelia Gentsch <Kornelia.Gentsch at unige.ch
> wrote:

>   Dear all,
>
>
>
> Sorry for asking the same question again but I am confused because of
> opposing replies. One reply was that it is okay to keep Cz for ICA when Cz
> is the reference channel for importing Biosemi EEG data into EEGlab (the
> reference channel is flat after the data were imported). The other reply
> was that when Cz is the reference channel for data import it must be
> removed prior to ICA.
>
>
>
> Could you please let me know which reply is the correct one?
>
>
>
> Thank you very much in advance!
>
>
>
> Kornelia
>
>
>
> _______________________________________________
> Eeglablist page: http://sccn.ucsd.edu/eeglab/eeglabmail.html
> To unsubscribe, send an empty email to
> eeglablist-unsubscribe at sccn.ucsd.edu
> For digest mode, send an email with the subject "set digest mime" to
> eeglablist-request at sccn.ucsd.edu
>



-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20150107/10200a50/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.gif
Type: image/gif
Size: 70 bytes
Desc: not available
URL: <http://sccn.ucsd.edu/pipermail/eeglablist/attachments/20150107/10200a50/attachment.gif>