Theories of Emotion: James-Lange, Cannon-Bard & Schachter-Singer

1. Nature and Components of Emotion

An emotion is a complex, short-lived psychological state triggered by an external or internal stimulus, involving three coordinated components:

1. Physiological Component: Autonomic arousal (increased heart rate, pupil dilation, sweating, adrenaline secretion).
2. Behavioral / Expressive Component: Observable facial expressions, body postures, vocal tone, and gestures.
3. Cognitive / Subjective Component: The conscious feeling and cognitive appraisal of the situation (e.g., labeling an experience as fear, joy, or rage).

2. Comparison of the Three Classic Western Theories

3. Detailed Theory Breakdowns

A. James-Lange Theory (William James & Carl Lange)

• Core Hypothesis: Physiological arousal precedes emotional experience.
• Classic Example: You are hiking in the jungle and encounter a growling bear. Your heart pounds and your legs sprint away. Your conscious brain registers your trembling body and racing pulse, and concludes: “I am terrified!”
• Criticism by Walter Cannon: Visceral bodily changes are too slow and non-specific to account for the rich, lightning-fast diversity of human emotions (e.g., heart rate increases in both fear and romantic excitement).

B. Cannon-Bard Theory (Walter Cannon & Philip Bard)

• Core Hypothesis: The Thalamus serves as the emotional dispatch station.
• When an emotional stimulus is perceived, the thalamus sends simultaneous signals:
  1. Downward to the sympathetic nervous system, mobilizing physical fight-or-flight energy.
  2. Upward to the cerebral cortex, producing the subjective emotional feeling.
• Physiological arousal and emotional experience occur in parallel without one causing the other.

C. Schachter-Singer Two-Factor Theory (Stanley Schachter & Jerome Singer, 1962)

• Core Hypothesis: Emotion is determined by an interaction between general physiological arousal and environmental cognitive appraisal.
• The Suproxin Experiment: Participants injected with epinephrine (adrenaline) were placed in rooms with either a euphoric actor or an angry actor. Participants who were not forewarned about the drug’s physical effects adopted the emotion of the actor, demonstrating that they cognitively labeled their ambiguous bodily arousal according to external social cues.

4. Exam Review Summary Table