Experience of emotion involves awareness of our physiological responses to emotion- arousing stimuli. Cannon-bard theory: arousal and emotion happen at the same time. Emotion-arousing stimulus simultaneously triggers (1) physiological responses and (2) the subjective experience of emotion. Schachter and singer two-factor theory: arousal + label = emotion. Emotions have two ingredients: physical arousal and cognitive appraisal. Emotional experience requires a conscious interpretation of arousal. Zajonc and ledoux: emotion and the two-track brain. Sometimes emotional responses take a neural shortcut that bypasses the cortex and goes directly to amygdala. Brain processes much information without conscious awareness, but mental functioning still takes place. Emotions arise when an event is appraised as harmless or dangerous. The functional divisions of the human nervous system. Sympathetic subdivision: arouses and expends energy and enables voluntary control of skeletal muscles. Parasympathetic subdivision: calms and conserves energy, allowing routine maintenance activity and controls involuntary muscles and glands. Brain scans and eegs reveal different brain circuits for different emotions.