[Eeglablist] Electrolyte gel question

Frank Preston ffpresto at uwaterloo.ca
Thu Dec 3 04:05:57 PST 2015


I'm interested to know what EEG systems you're running. We have 64 channel BioSemi Active 2 and Brain Vision actiCHamp systems and are wondering if we can use the same gel with both.

  .. Frank

Frank Preston
Psychophysiology Lab Technician          University of Waterloo
PAS 2270, Psychology Department        200 University Ave. W.
Phone: 519-888-4567 x 38976               Waterloo, Ontario, N2L 3G1
From: eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu] on behalf of Makoto Miyakoshi [mmiyakoshi at ucsd.edu]
Sent: December 2, 2015 6:42 PM
To: Stephen Politzer-Ahles
Cc: eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] Electrolyte gel question

We (Swartz Center) use Signa gel, manufactured by Parker.


On Wed, Dec 2, 2015 at 12:42 PM, Stephen Politzer-Ahles <stephen.politzer-ahles at ling-phil.ox.ac.uk<mailto:stephen.politzer-ahles at ling-phil.ox.ac.uk>> wrote:
Hi Pamela,

Most of the gels I have used also have [small] bubbles in them, and as
far as I know it hasn't affected the recording quality; they get
rubbed out anyway when I apply the gel and rub it around, abrade the
skin, etc.

In my experience, I can get the gel I use to be less bubbly if I stir
it vigorously, although I'm not sure if it really matters.

I've generally had good luck with SuperVisc high viscosity gel
recently (http://www.brainproducts.com/files/public/products/brochures_material/pr_articles/0801_SuperVisc_FM.pdf),
and with similar gels in the past (although I don't have the exact
names on hand; I think the manufacturer was ElectroCap).


On 12/2/15, Makoto Miyakoshi <mmiyakoshi at ucsd.edu<mailto:mmiyakoshi at ucsd.edu>> wrote:
> Dear Pamela,
> Would you mind letting me know source of info that bubbles in the gel
> affect recording quality? I want to learn it more.
> Makoto
> On Tue, Dec 1, 2015 at 2:29 PM, Pamela Leigh Stevenson <
> pamela.stevenson at unb.ca<mailto:pamela.stevenson at unb.ca>> wrote:
>> Hello everyone!
>> I would like to get your advice on an issue related to electrolyte gel:
>> We ordered some electrolyte gel this summer and noticed that it arrived
>> full of bubbles. We contacted the company to let them know and they send
>> us
>> some replacement gel. Unfortunately, the replacement gel has just as many
>> bubbles as the original batch. We sought advice on how to decrease the
>> amount of bubbles from the company who makes the gel, but nothing they
>> suggested has helped. This has made data collection much more difficult
>> (in
>> terms of reducing electrode impedance).
>> Have any of you experienced this? If so, have you been able to reduce the
>> amount of bubbles in the gel? Can anyone suggest a brand of gel that you
>> have had a good experience with?
>> Thank you for your advice/suggestions!
>> Pam
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> --
> Makoto Miyakoshi
> Swartz Center for Computational Neuroscience
> Institute for Neural Computation, University of California San Diego


Stephen Politzer-Ahles
University of Oxford
Language and Brain Lab, Faculty of Linguistics, Phonetics & Philology

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