The Faces of Positive Emotion

@article{Shiota2003TheFO,
  title={The Faces of Positive Emotion},
  author={Michelle N. Shiota and Belinda Campos and Dacher Keltner},
  journal={Annals of the New York Academy of Sciences},
  year={2003},
  volume={1000}
}
Although several theorists posit the existence of multiple discrete positive emotion states,1–4 much empirical research on the nature and consequences of emotion considers only one: happiness.5–8 Studies of the facial display of emotion have documented universally recognized expressions of sadness, anger, fear, and other negative emotions, but have not differentiated among positive emotions.6 The Duchenne smile, which includes contraction of the orbicularis oculi as well as the zygomaticus… 
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