[Eeglablist] re-referencing

[Nikolai Novitski]

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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