Galvanic skin response

From Psy3242

History

Galvanic skin response (GSR) is also known as electrodermal response (EDR), psychogalvanic reflex (PGR), and skin conductance response (SCR). It is a method of testing where the electrical resistance of the skin measures the sympathetic activity and emotional arousal of a subject. The use of GSR began in the 1900s, but was not used extensively for research purposes until the 1960s and 1970s. It is now used as a lower-cost alternative to much more advanced scientific testing techniques such as electroencephalogram (EEG) and magnetic resonance imaging (MRI).

Method

GSR records changes in electrodermal activity, by attaching 2 leads to the skin for a base measurement, then recording changes made while the subject performs a test or activity. There are two ways to conduct a GSR: active GSR and passive GSR. In active GSR, the resistance of a current that is passed through the body is measured. In passive GSR, current that is generated by the body itself is measured.

Uses

Galvanic skin response is especially sensitive in measuring responses from emotions such as fear and anger, as well as the startle response, orienting response, and sexual feelings. GSR is used for polygraph testing and E-meters, and is used in hypnotherapy and psychotherapy, as well as behavior therapy.