From: peterson_at_d...
Date: 2001-05-21 23:29:38
--- In buildcheapeeg_at_yahoogroups.com, jiva_at_humboldt1.com wrote:
>
> > > ...
> > > > 2) i wonder if the choice of electrodes might influence
> > > > the issue?
> > >
> > > Different electrode types might have different impedances,
> because. R and C parts of the impedance will vary depending
on
> electrode area, material and used electrolyte / conductive gel.
>
> > Sometimes it's hard to get the same impedance out of the same
> > electrode on two different scalps, or even on 2 different spots
on
> > the same scalp.
>
> Would any of the list members who work with electrodes care to
> choose which to use for this project?
I think that this electrode issue is going to turn out to be less
critical than everybody thinks. I've heard of people mixing tin and
silver electrodes (10 mm disk kind) in the same montage, and people
commonly change from all-tin to all-silver or gold with the same
equipment. The trick is to get the same impedance at all the
electrodes in the montage. I think that just about any kind of
electrode you pick will work. There is probably a lot more impedance
variation between the bald, exposed skin on top of my head at Cz and
the skin at my haired-over mastoid process behind my ear than there
is between any two different electrode types you are likely to see in
common use. Just choose something and go with it.
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