[Eeglablist] Question Regarding Impedance Problem

[Kathryn Campbell]

Thanks for your reply.   I thought that if the ground and reference
electrodes were not working properly, my eye electrodes would show the same
problem?  My eye electrodes are connected to the cap. I will attempt to
measure the impedance for these electrodes separately to see if there is a
broken connection somewhere.

Thanks
Kathryn

On 27 February 2013 10:13, Michael Schubert <mschuber at mail.upb.de> wrote:

> Hi Kathryn,
>
> from my experience I would suggest to check for broken reference/ground
> electrode(s). Usually the impedance is measured against a common ground
> electrode (which you described). To do this, try and see if you can set a
> different cap-electrode or even an extra-electrode placed somewhere else as
> ground/reference. If it works and the other electrodes show good impedances
> again, you probably would have to replace your ground/reference electrode
> in your cap.
>
> Hope this helps,
>
> Michael
>
>
> Am 26.02.2013 um 04:25 schrieb Kathryn Campbell <
> kacey.a.campbell at gmail.com>:
>
> Hi,
>
> I have a question regarding my impedance's when setting up for an EEG.  I
> am using an EEG cap and I have had not problems getting my impedances down
> to an acceptable level until last week.  My facial electrodes (eyes) seem
> to be fine but my cap electrodes will not reduce impedance at all.  I have
> tried giving them a clean with ivory wash instead of what I was using
> previously and this seemed to help a bit- my impedances at least responded
> when I filled the electrodes with gel.  However, in an effort to reduce my
> impedances further, I went back to try to improve the ground connection.
> After doing this, all impedances went back to terrible again and would not
> respond to gel/abrasion attempts.  Any ideas what is going wrong?
>
> Thanks
> Kathryn
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