<div>Dear all,</div>
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<div>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.
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<div>So, I have two questions.</div>
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<div>1) Is there any reason why re-refencing to more than one electrode doesn't work after or is it a bug?</div>
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<div>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?</div>
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<div>Thank you in advance.</div>
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<div>Nikolai Novitski,</div>
<div>KU Leuven</div>