E.g. heart beat, skin perspiration, facial muscles tell about the emotional state of the user. The physiological reactions are recorded with sensors attached to the participant. This objective data can be used in combination with self-report data to find out what the user experienced.
User's physiological responses are measured when comparing different designs or when interacting with a system.
Investigates momentary experiences without intervening in the interaction
Momentary emotions are important in some domains only.
Mandryk, R.L., Inkpen, K., and Calvert, T.W. Using
References describing the method
psychophysiological techniques to measure user
experience with entertainment technologies. Behaviour and Information Technology (Special Issue on User Experience), 25,2, (2006), 141-158.