The Skin Conductance Sensor measures sweat gland activity on the hand, which is closely correlated with sympathetic nervous system activity, arousal and stress. This variable can be used for several biofeedback applications and is called SC (Skin Conductance), SCA (Skin Conductance Activity), EDA (ElectroDermal Activity), or GSR (Galvanic Skin Response).
Skin conductance (SC) is expressed in micro-siemens or micro-mho and increases when the arousal level increases. During relaxation, the SC level normally decreases. The Skin Conductance Sensor has been designed to measure very small (1/1000 micro-siemens) relative changes in skin conductance.
Skin Conductance Electrodes are included. These Ag-AgCL electrodes snap into the two connectors. and are usually attached to two fingers or two sites on the palm. The electrodes are secured by velcro straps. Make sure they are not fastened too tight since that will impair blood flow. It does not matter which electrode is placed on which finger, as polarity is not important. We recommend replacing the Velcro Finger Electrodes after around 100 times.
Use the Temperature Sensor in combination with the Skin Conductance Sensor in order to monitor both temperature and sweat gland activity on the hand.
The specifications of the Skin Conductance Sensor are:
|Parameter||Skin conductance (SCA, EDA, GSR)|
|Electrodes||Skin conductance electrodes (snap-on connection)|