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An Argument for Using Biometrics to Investigate Audience Engagement with Performance Stimuli. Neurophysiologists agree that emotions can “exist outside of consciousness” (1, p. 1846), and the skin can reveal information about an individual’s emotional state during a specific event. To capture this, Galvanic Skin Response (GSR)—also referred to as Electrodermal Activity (EDA) or Skin Conductance (SC)—measures changes in the skin’s electrical conductance associated with autonom