The variation of a low-voltage applied current between the two electrodes is used as measure of the EDA. The GSR signal is very easy to record: in general just two electrodes put at the second and third finger of one hand are necessary. Such system is directly involved in the emotional behavioural regualation in the humans.Īdditional studies highlighted the relationship between GSR signal and some mental states, such as stress, drowsiness and engagement. In this way, skin conductance can be a measure of the human Sympathetic Nervous System responses. In particular, if the sympathetic branch ( SNS) of the autonomic nervous system is highly aroused, then sweat gland activity also increases, which in turn increases skin conductance, and viceversa. Human body sweating is regulated by the Autonomic Nervous System ( ANS). The traditional theory of the GSR analysis is based on the assumption that skin resistance varies with the state of sweat glands in the skin.
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