“Laughing” rats and the evolutionary antecedents of human joy?

@article{Panksepp2003LaughingRA,
  title={“Laughing” rats and the evolutionary antecedents of human joy?},
  author={Jaak Panksepp and Jeffrey S. Burgdorf},
  journal={Physiology \& Behavior},
  year={2003},
  volume={79},
  pages={533-547}
}

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