Search found 3 matches

by Uli
Tue Mar 22, 2005 3:45 pm
Forum: BioSemi Software (ActiView executable)
Topic: Computing electrode offset?
Replies: 5
Views: 20031

Computing electrode offset?

Hi all,

does anyone know how the electrode-offset values in
Actiview are computed ?

Are these values calculated directly from the data that is coming from READ_MULTIPLE_SWEEPS (Labview.dll) or are there special parameters that need to be sent via the API?

Best Regards

Ulrich
by Uli
Mon Nov 22, 2004 1:46 pm
Forum: BioSemi Hardware
Topic: P300 and CMS/DRL
Replies: 3
Views: 18455

Thanks for your answer Coen. Indeed my previous post was way too fuzzy, but not fully incorrect :). I thought more about it and here's what I think is happening: 1) Let the potentials of the electrodes Oz, Cz, CMS and the Amplifier Common (AC) be Oz = 1, Cz = 10, CMS = 10, AC = 0 (all with respect t...
by Uli
Fri Nov 19, 2004 11:43 am
Forum: BioSemi Hardware
Topic: P300 and CMS/DRL
Replies: 3
Views: 18455

P300 and CMS/DRL

Hi Biosemi users, I am recording P300 event related potentials with a 32 channel Biosemi Active Two system. Strangely enough I'm seeing an inverted P300 (i.e. negative peaks) at some occipital and temporal electrodes in my data (referencing to average reference does not change this effect). To my un...