Search found 4 matches

by PB
Fri Feb 08, 2008 10:57 am
Forum: BioSemi Hardware
Topic: very slow wave at frontal sites
Replies: 2
Views: 8013

Hi jeffreyj,

I also see these slow waves in frontal electrodes from time to time. I am quite sure they are due to sweating. This modulates the skin conductance at the forehead and could theoretically lead to this kind of effect. I haven't done any real tests of though...

P
by PB
Wed Jun 21, 2006 5:09 pm
Forum: EEG data analysis
Topic: Reference and averaging
Replies: 1
Views: 6340

Reference and averaging

Hi, I just realized that when I average my EEG data (in order to get an ERP) I am using the unreferenced (i.e. CMS referenced) signal. First AFTER the averaging I choose an other channel as reference. As far as my (incomplete) understanding goes, I have to do the re-referencing BEFORE making the ave...
by PB
Thu Jan 26, 2006 6:53 pm
Forum: BioSemi Hardware
Topic: Skin electrodes
Replies: 2
Views: 16243

Aah, the reason why it didn't work was because I tried to plug the GSR electrodes to an Mk1 box instead of an Mk2 box. Now everything works fine.

Thanks,
P
by PB
Wed Jan 25, 2006 12:46 pm
Forum: BioSemi Hardware
Topic: Skin electrodes
Replies: 2
Views: 16243

Skin electrodes

Hi,

Our Biosemi system came with a little bonus: 2 skin electrodes. Its not the ordinary flat ones. These connects to the aux3 of the AD-box and seems to be passive.

The problem is that I can't get a signal in ActiView. Do I need a modified version of ActiView or what?

Cheers,
P