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Table 1 Examples of emotion stimuli

From: Analysis of physiological signals for recognition of boredom, pain, and surprise emotions

Emotion Stimulus
Boredom
Repetitive sounds of numbers from 1 to 10 (3 min)
Pain
Induction of pain by using a blood pressure cuff (1 min)
Surprise
Sudden sounds of hog-caller, breaking glass, and thunder during concentration on a game-like computer task (1 min)