Generalized reciprocity in rats.

@article{Rutte2007GeneralizedRI,
  title={Generalized reciprocity in rats.},
  author={Claudia Rutte and Michael Taborsky},
  journal={PLoS biology},
  year={2007},
  volume={5 7},
  pages={e196}
}
The evolution of cooperation among nonrelatives has been explained by direct, indirect, and strong reciprocity. Animals should base the decision to help others on expected future help, which they may judge from past behavior of their partner. Although many examples of cooperative behavior exist in nature where reciprocity may be involved, experimental evidence for strategies predicted by direct reciprocity models remains controversial; and indirect and strong reciprocity have been found only in… CONTINUE READING

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