[Eeglablist] bipolar channels for eyes movement recording

[Scott Makeig]

Igor - Yes, bipolar channel data are still linearly related to source
activities, and are therefore suitable for decomposition by ICA, even along
with  common reference channels. Visualizing the ICA component maps, though,
is not possible, stricly speaking, since the bipolar channels are 'floating'
from the other channels.

One interesting possibility would be to add a common offset to each pair of
bipolar channels that maximizes the resulting smoothness of the
common-reference + bipolar component scalp map.... though I have not tried
this.

Scott Makeig

On 6/21/06, Igor Riecansky <igor.riecansky at savba.sk> wrote:
>
> Dear Arno et al.,
>
> I have a question concerning bipolar EOG recording. I read your advice in
> the tutorial to use common-reference recording for all channels including
> EOG. However, separate bipolar recording of EOG (with separately set
> parameters) enables, I assume, to enhance the sensitivity to ocular
> artifacts. Is it possible/valid to include such bipolar channel(s) into a
> multichannel EEG recording and submit the whole data to ICA in order to
> separate and remove the ocular artifacts?
>
> Thank you for advice,
>
> Igor
>
>
>
>
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