Dumb question on connecting Gold Cup electrodes to Ganglion

hackr

I love asking really dumb questions like this, but please feel free to help me know what I should've been reading to figure this out for myself

On the Ganglion board I see there are 2 rows of header pins labeled

-1+
-2+
-3+
-4+

Since there are 4 channels, I take it this is where you connect your electrodes (the Gold Cup ones from the Shop, in my case). If that much is correct, then I'm confused by the fact that there's 2 pins for each channel. From what I can tell there's only 1 wire per electrode. To which pin should I be connecting the header and what should be connected to the other pin?

hackr

I've found something that sounds related to this in one of the tutorials now, but I'm still trying to understand it

wjcroft

On both the Cyton and Ganglion, each channel can be used either with a common reference; or as differential pairs. The tutorial explains how to set your Ganglion onboard switches that select the mode. For EEG-only you want the common reference mode. So one wire per channel; plus Reference and Ground leads.

hackr

Thank you very much! I think this is much more clear to me now.