Cannon Bard Theory of Emotion (Chapter 11)

This theory describes a correlation between emotions and bodily functions. And says that an emotion-provoking event leads to both an emotion and bodily reactions occurring at the exact same moment. So if the stimulus is seeing someone you have not seen in a while you may feel happy and smile simultaneously. I think this is an interesting theory as emotion-provoking events are often memories that people will remember for a long time.