[Eeglablist] Average Reference

[Makoto Miyakoshi]

Dear Claudio,

> As far as i know by now, different reference electrodes do not affect the
scalp distribution.

Oh it does change the scalp distribution. For ICA it does not.

> I asked me this question, because theoretically the summed activity of
all electrodes equals zero only if you have a comprehensive electrode
montage.

That's a good point. And the head should be a perfect sphere (with no neck)
too :-)

> Thus, are 64 electrodes enough for using an online average reference?

Practically no problem.

Makoto

On Fri, Mar 13, 2015 at 6:12 AM, Claudio Georgii <
Claudio.Georgii at stud.sbg.ac.at> wrote:

> Hi,
> i am Claudio Georgii, a Ph.D. student at the University of Salzburg,
> Austria. I am currently working with EEGlab to analyse my EEG data in the
> source space using the measure projection toolbox (MPT).
>
> I try do evaluate know whether using an online average reference (64
> electrode system) has an impact on the source distribution. As far as i
> know by now, different reference electrodes do not affect the scalp
> distribution. But have different electrode montages, while using an online
> average reference, an impact on the scalp distribution?
>
> I asked me this question, because theoretically the summed activity of all
> electrodes equals zero only if you have a comprehensive electrode montage.
> Thus, are 64 electrodes enough for using an online average reference?
>
> Best,
> Claudio
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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