How is EDA measured?
EDA can be measured in many different ways including skin potential, resistance, conductance, admittance, and impedance (ref: Electrodermal Activity by Wolfram Boucsein). The Affectiva Q Sensor provides a way to capture electrical conductance (inverse of resistance) across the skin. This measurement involves passing a minuscule amount of direct current between two electrodes in contact with the skin. The units of measurement are microSiemens (μS).