[Eeglablist] Weakened signal at Pz electrode

[Roni Shafir]

Hi all,
We are using BioSemi in our experiments and recently moved from 64
electrodes to 32 electrodes.
We are still using the 64 electrode caps.
Something very strange that I noticed is that since we moved to 32
electrodes, Pz electrode has a very low (kind of flat) signal, as apposed
to what I used to see when we used 64 electrodes.
What could be the problem? I thought it may be related to the recording
system or the online reference.
Importantly, there is no problem with the electrode because I used
different sets and this pattern remained unchanged.
Did anyone have this problem already?
Would appreciate your help.
Roni
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