[Eeglablist] reference one more time

Rita Ceponiene rceponiene at crl.ucsd.edu
Thu Jun 2 15:43:14 PDT 2005

I wonder whether it is better to use a single-mastoid referenced data or
average-mastoid referenced data when training ICA on continuous data?
When one mastoid is used for the reference, another mastoid is typically
left in the dataset - can this induce a bias in the component
configuration, especially over the back of the head? On the other hand,
when average of both mastoids is used, both channels have data in them,
which is, however, 100% correlated and smaller in magnitude than data on
other channels. Will this affect ICA or not (since the manipulation was
linear)? If it will, should both mastoid channels be deleted from the
Thank you-
Rita Ceponiene    
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