[FieldTrip] excessive channel correlations

Eelke Spaak e.spaak at donders.ru.nl
Fri Apr 13 08:45:23 CEST 2018

Hi Roy,

I have no suggestion as to what might be causing this, but one
suggestion on how to pragmatically deal with it, or at least maybe get
some more insight.

> - the problem is there regardless of reference montage (e.g., forehead and
> averaged mastoids)

Have you tried common average reference? If the signal is there on all
channels, subtracting the common average should get rid of it.


> - gel bridging, while theoretically possible, seems unlikely given that
> literally all EEG channels are (almost) identical
> We're still investigating but wanted to hear if  anyone ever observed
> anything like this? Were they able to solve it?
> Thanks,
> Roy
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