From: Doug Sutherland (wearable_at_earthlink.net)
Date: 2002-02-04 19:41:33
John,
I'm not an expert like Jim on analog or capacitance, etc, but
I've played with EEG. IMO we need to stick with proven
methods, not reinvent wheels. I think Jim is of the same kind
of mentality as me re "less is more" and "keep it simple"
and "make it work before extending". So, re electrodes,
remember, this is your SOURCE of data, and if Joerg
builds the BEST amplifier, it will be useless if the electrode
connection is faulty. Therefore, I already know what I am
planning to do, I am going to buy medical electrodes,
10/20 paste, and follow the traditional prep methods.
I have some links to info on electrodes here ...
http://home.earthlink.net/~wearable/biopsy/#biofeedback-sensors
http://home.earthlink.net/~wearable/biopsy/#measurement-eeg
Namaste,
Doug
John Morrison wrote:
> Thanks
> So what I get from that is
> "Because of the irregular surface of the skin, such high capacitance can
> not be attained by just pressing metal electrodes on the skin. Therefore we
> do not believe in the concept of a dry electrode for high quality
> bioelectric measurements, and as a result we do not offer such an
> electrode."
>
> But if the electrodes were pins (NOT sharp) then the irregular surface
> wouldn't be a problem and the GUNK factor would disappear. :-)
>
> ___________/-------
> |||||||||||
> SKIN
>
> Anyway We'll see
>
> John
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