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

[Tarik S Bel-Bahar]

Greetings Kornelia, happy new year, hoping there below helps a little:

I think the general guideline is to not include in your ICA runs those
channels which are used as the (online) reference(s) during the actual
recording session. Overall, "the effect of an active reference on EEG
recording is one of the oldest technical problems in the study of human
EEG". Some discussion of single and multi-channel common references can be
found here: http://sccn.ucsd.edu/wiki/Chapter_04:_Preprocessing_Tools . Please
also consider reviewing Luck's ERP handbook for some discussion of
referencing. Cheers!








On Tue, Dec 30, 2014 at 10:57 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
>
>
>
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