[Eeglablist] re-referencing

[Nikolai Novitski]

Thank you very much, this solves the problem.

On 5/10/07, Sarnthein Johannes <Johannes.Sarnthein at usz.ch> wrote:
>
> Dear Nikolai,
>
> we do exactly the same thing you want to do.
> These are the lines that you need for your script
> (I don't remember the GUI-buttons to be clicked):
>
> % re-references 61 cephalic channels to (M1+M2)/2: chans 40 and 60;
> % excludes bipolar channels 62:64 from re-referencing
> EEG.data = reref(EEG.data, [40 60], 'method', 'withref', 'refloc',{
> 'CPz',180,0.1},...
> 'exclude', [62:64],'keepref', 'off');
> % assigns new electrode labels and coordinates
> EEG.chanlocs=pop_chanedit(EEG.chanlocs, 'load',{ 'fms63.loc',
> 'filetype',''});
>
> The file fms63.loc contains the new electrode listing.
> Be aware that the data from CPz now appear at EEG.data(end,:).
> This means that you have to label your last EEG trace with CPz
> and assign the according coordinates in fms63.loc.
> (I had tried for some days to get the trace of CPz between CP1 and CP2
> but finally gave up).
>
> Best,
> Johannes
>
>
> ________________________________
>
> Von: eeglablist-bounces at sccn.ucsd.edu
> [mailto:eeglablist-bounces at sccn.ucsd.edu] Im Auftrag von Nikolai
> Novitski
> Gesendet: Dienstag, 8. Mai 2007 22:23
> An: eeglablist at sccn.ucsd.edu
> Betreff: [Eeglablist] re-referencing
>
>
> Dear all,
>
> We are recording EEG in Neuroscan referenced to CPz; the position of the
> reference it is hard-wired in our Maglink cap. Then we need to
> rereference to the average of both mastoid leads. It goes ok if no ICA
> had performed on this data. After the ICA however the program returns an
> error on trying to re-reference to the average of 2 electrodes.
> Re-referencing to one single electrode it works ok. It wouldn't be a
> problem to re-reference before ICA, but we also have two bipolar
> channels for EOG and those are treated as referenced to common reference
> during rereferencing, thus they are re-referenced together with all the
> rest.
> So, I have two questions.
>
> 1) Is there any reason why re-refencing to more than one electrode
> doesn't work after or is it a bug?
>
> 2)Is it possible to mark bipolar channels as bipolar so that they are
> not effected by the re-referencing of the common-referenced electrodes?
>
> Thank you in advance.
>
> Nikolai Novitski,
> KU Leuven
>
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