Libelium MySignals SW - Gsr

-187- v2.9
Sensors
7.1.9. GSR
Skin conductance, also known as galvanic skin response (GSR) is a method of measuring the electrical conductance
of the skin, which varies with its moisture level. This is of interest because the sweat glands are controlled by the
sympathetic nervous system, so moments of strong emotion, change the electrical resistance of the skin. Skin
conductance is used as an indication of psychological or physiological arousal, The Galvanic Skin Response Sensor
(GSR - Sweating) measures the electrical conductance between 2 points, and is essentially a type of ohmmeter.
7.1.9.1. Sensor features
Description: This sensor measures the electrical conductance of the skin, which varies with its moisture level. This
is of interest because the sweat glands are controlled by the sympathetic nervous system, so moments of strong
emotion, change the electrical resistance of the skin.
Figure: GSR Sensor
In skin conductance response method, conductivity of skin is measured at ngers of the palm. The principle or
theory behind functioning of galvanic response sensor is to measure electrical skin resistance based on sweat
produced by the body. When high level of sweating takes place, the electrical skin resistance drops down. A dryer
skin records much higher resistance. The skin conductance response sensor measures the psycho galvanic reex
of the body. Emotions such as excitement, stress, shock, etc. can result in the uctuation of skin conductivity. Skin
conductance measurement is one component of polygraph devices and is used in scientic research of emotional
or physiological arousal.
The sensor needs to be connected to the specic GSR jack connector in MySignals board and it works with direct
connector power supply.
Measurement:
Parameter Unit Range
Conductance Siemens 0-20 Siemens
Resistance Ohms 10K-100KOhms
Voltage Volts 0-5V