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NPB+112+11+emotions+lecture+notes - NPB 112 Winter 2011...

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1 NPB 112, Winter 2011: Emotions and the limbic system (3/3/11) OUTLINE I. Theories of emotions- James-Lange vs. Cannon Bard II. Hypothalamus and aggression III. Amydala and fear IV. Reward and pleasure I. Theories of emotions a. James-Lange Theory (1884) Emotion experienced in response to physiological changes in the body i.e. the physiological changes are the emotion (you are sad because you cry) b. Cannon-Bard Theory (1927) Emotional experience can occur independent of emotional expression i.e. emotions can be experienced even if physiological changes cannot be sensed i. Evidence: emotions intact after spinal transection weak correlation between emotional experience and physiology e.g. increased heart rate is associated with many emotional states II. Hypothalamus & Sham Rage (Fig. 29.1) a. Bard’s Experiment (1928) Bilateral removal of the cerebral hemispheres, hypothalamus intact: Sham Rage increased blood pressure and heart rate dilation of the pupils erection of the hairs on the back and neck arching of the back lashing the tail snarling b. Hess (1920s) Behavioral sequences evoked by stimulating hypothalamus: Panting Sniffing Eating fear and anger sham rage
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