1) Emotions are subjective sensations that arise from an interaction of perception, neural responses, cognitive appraisal, and expression.
2) Major theories of emotion include James-Lange theory, Cannon-Bard theory, and Schachter-Singer theory. Lazarus theory emphasizes cognitive appraisal.
3) Emotions can be measured through physiological responses, thoughts, and behaviors. The limbic system and amygdala are strongly associated with emotion processing in the brain.
4) Basic emotions include those universally expressed through facial expressions like anger, fear, sadness, and disgust. Display rules are cultural norms that govern emotional expression.