[Eeglablist] Old EGI system

Daniel Alschuler alschul at nyspi.columbia.edu
Fri Nov 14 10:42:33 PST 2014

Dear Heather,

An electrical distance-based analysis may also be helpful in looking for salt bridges or certain other oddities in the data. I would recommend the eBridge script for EEGLAB presented in Alschuler et al., 2014 and based on the intrinsic Hjorth approach presented in Tenke and Kayser, 2001 (see http://psychophysiology.cpmc.columbia.edu/eBridge for the script and full citations).

Dan Alschuler
From: eeglablist-bounces at sccn.ucsd.edu [eeglablist-bounces at sccn.ucsd.edu] on behalf of K Jeffrey Eriksen [eriksenj at ohsu.edu]
Sent: Tuesday, November 11, 2014 3:53 PM
To: 'Benz, Heather *'; eeglablist at sccn.ucsd.edu
Subject: Re: [Eeglablist] Old EGI system


In general I think visual inspection should be sufficient. I have two other suggestions:

1.       Borrow a new (or trusted) Net from someone in another lab and run a short EEG on a single subject with each Net for comparison. Besides visual comparison you could look at impedances.

2.       Perhaps the EGI tool for measuring salt bridges could help, or you could write your own Matlab code to perform cross-channel correlations to look for odd behavior

Good luck with it,
-Jeff Eriksen

From: eeglablist-bounces at sccn.ucsd.edu [mailto:eeglablist-bounces at sccn.ucsd.edu] On Behalf Of Benz, Heather *
Sent: Friday, November 07, 2014 5:39 AM
To: eeglablist at sccn.ucsd.edu
Subject: [Eeglablist] Old EGI system

We just inherited a barely used EGI system, purchased circa 2009. When we chatted with an EGI rep, he said we’d probably want to send in all of the EEG nets for refurbishment, which of course comes with a price tag. Before we send them in, I’d like to run a few trial sessions and see how they behave. I can spot really terrible channels by eye, but I’m wondering if there are small-to-medium problems that could have developed with the nets (or any EEG caps in general), which wouldn’t show up just by watching the data scroll by, that I should be looking out for?

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