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Sense-IT mobile phone graphical user interface, first version. The yellow switch starts and stops the measuring of heart rate (HR) via the smartwatch. Each recorded change in level of HR (or physiological correlate of emotional arousal [PCEA]) is represented a blue bar in the white area of the screen. The date and time of the change are displayed within the blue bar, and the level of the PCEA appears as a number in the circle left of the bar.
