The Two-Factor Theory of Emotion, proposed by Stanley Schachter and Jerome Singer in 1962, addresses the limitations of earlier emotional frameworks such as the James-Lange theory (which argued that emotion is strictly the perception of bodily changes) and the Cannon-Bard theory (which argued for simultaneous, independent physiological and conscious emotional experiences).
- Core Postulate: Emotion requires two distinct components: general, undifferentiated physiological arousal and a cognitive label applied to that arousal based on environmental cues.
- The Schachter-Singer (1962) Experiment: Participants were injected with epinephrine (adrenaline) and told either true, false, or no information about its actual physical effects (e.g., heart palpitations, trembling). They were then placed in a room with a confederate who behaved either euphorically or angrily. Participants who lacked an adequate physiological explanation for their bodily state (ignorant or misinformed groups) adopted the emotional state of the confederate, demonstrating that ambiguous arousal is labeled via cognitive appraisal of social context.
- Misattribution of Arousal: A direct extension of this theory is the misattribution paradigm, where an individual incorrectly attributes their physiological arousal to a wrong source, altering their emotional experience (demonstrated later in Dutton and Aron's 1974 suspension bridge study).