[Eeglablist] Electrolyte gel question

[Frank Preston]

Hi,

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.

Thanks,
  .. 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.

Makoto

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).

Best,
Steve

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
http://users.ox.ac.uk/~cpgl0080/
<http://www.nyu.edu/projects/politzer-ahles/>



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