Final answer:
The subject of this question is the Schachter-Singer two-factor theory, which proposes that emotion is determined by physiological arousal and cognitive interpretation.
Step-by-step explanation:
The subject of this question is the Schachter-Singer two-factor theory. This theory proposes that emotion is determined by two factors: physiological arousal and cognitive interpretation. According to this theory, when we experience a physiological response (such as increased heart rate) in a certain situation, we then interpret the situation and label our emotion based on our cognitive appraisal of the situation.