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Chimpanzees Show a Developmental Increase in Susceptibility to Contagious Yawning: A Test of the Effect of Ontogeny and Emotional Closeness on Yawn Contagion
- Elainie Alenkær Madsen,
- Tomas Persson,
- Susan Sayehli,
- Sara Lenninger,
- Göran Sonesson
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- Published: October 16, 2013
- https://doi.org/10.1371/journal.pone.0076266