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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

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