The physiological data that Optimal Office™ measures from the thumb of the user is the skin conductance level (SCL). It is a physiological measure for mental stress.
SCL, also called galvanic skin response (GSR), is the measurement of skin conductivity from the fingers and / or palms. The SCL is highly sensitive to emotions in almost all people. Measuring and showing SCL to a user in real time (biofeedback) has long been used for relaxing and desensitization training. It has also been used in important research on anxiety and stress levels (Fenz & Epstein, ' 67); and it has been a part of lie detection (Raskin, ' 73).
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