What theory maintains that emotion is caused by the interaction of physiological changes and the cognitive labeling of the reason for the physical reaction?

The two-factor theory of emotion, proposed by Stanley Schacter and Jerome Singer, suggests that emotions are a result of both physiological arousal and the interpretation of that arousal based on the individual's cognitive appraisal of the situation. This theory emphasizes the importance of both physiological responses and cognitive evaluations in the experience of emotions.