[Eeglablist] Weakened signal at Pz electrode

Makoto Miyakoshi mmiyakoshi at ucsd.edu
Mon May 18 10:31:24 PDT 2015

Dear Roni,

Yes I agree with Dezhong. If what he mentioned is the case, then you should
see smaller amplitude near the reference and larger at the distant
channels. You want to check if it is the case.


On Tue, May 12, 2015 at 4:39 AM, Roni Shafir <ronishafir1 at gmail.com> wrote:

> 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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Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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