I am collecting skin conductance data for a research study. For this, we apply a constant voltage (5v) to a participants finger and then measure the voltage at another finger (or I think this is what is happening, there is also something about a resistor in there [see attached schematic]). The software I am using is giving me readings of the voltage being measured on the second electrode, but I need to convert this to conductance. The attached schematic has a formula for doing this - R = [(+sig) / 5 - (+sig)]6M6 - but I don't understand it. I believe that the +sig is the output that I am getting in the software, which would just leave the 6M6 as the term that I don't know. Can anyone shed light on this for me? Thanks!