Biometric measures tend to refer to a group of techniques that measure a single output such as galvanic skin response (GSR). It is recognised that there is a relationship between activity in the sympathetic nervous system detectable by electrodes placed on the finger, and emotional arousal, although it is not possible to precisely identify the specific emotion being elicited. The GSR can be relatively sensitive to emotions in some individuals, but not all. Fear, anger, startle response, orienting response and sexual feelings are all among the emotions which may produce similar GSR responses. GSR is a useful tool for fast evaluation of the emotional saliency of a stimulus, prior to more in-depth analysis with EEG or FMRI.s.

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