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Research Article

Ingroup-Outgroup Bias in Contagious Yawning by Chimpanzees Supports Link to Empathy

  • Matthew W. Campbell mail,

    matthew.campbell@emory.edu

    Affiliation: Living Links Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America

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  • Frans B. M. de Waal

    Affiliation: Living Links Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America

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  • Published: April 06, 2011
  • DOI: 10.1371/journal.pone.0018283

About the Authors

Matthew W. Campbell, Frans B. M. de Waal
Living Links Center, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America

Corresponding Author

Email: matthew.campbell@emory.edu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: MWC FBMW. Performed the experiments: MWC. Analyzed the data: MWC. Wrote the paper: MWC FBMW.