2. EMOTION

3. Overview How Does the Brain Process Emotion? How Can You Tell if Someone is Lying? What Causes Emotion?

4. How Does the Brain Process Emotion? Autonomic Nervous System – Sympathetic functions (e.g., inhibit digestion) – Parasympathetic functions (e.g., stimulate digestion) Fight or Flight Response Limbic System

5. How Does the Brain Control Facial Expressions? Voluntary expressions controlled by motor cortex Involuntary expressions controlled by limbic system Universality suggests innate component

6. How Can You Detect a Lie? Assumption is that lying is associated with emotions such as guilt and anxiety Attempt to detect physiological correlates of these emotions

7. Polygraph Test Measure physiological changes – Galvanic Skin Response – breathing – blood pressure High false alarm rates

8. Detecting Lies from Facial Expressions Trained observers can spot “faked” facial expressions Based on voluntary vs. involuntary control

9. What Causes Emotions? James-Lange Theory Schacter-Singer Theory

10. James-Lange Theory A situation causes physiological changes (heart rate, breathing, hormones) and behavior (running, fighting) The brain labels the changes as emotions

11. Evaluating the James-Lange Theory Similar physiological changes for different emotions People with spinal cord injuries still experience emotions

12. Schacter-Singer Theory A situation causes physiological changes We interpret environmental cues

13. Evaluating the Schacter-Singer Theory Interpretation of arousal depends on the context Emotions can occur without physiological changes