Yawn contagion and empathy in Homo sapiens
Norscia and Palagi, PLoS ONE, 2011. One year of observation of adults over 16. Only social bonding predicted occurrence, frequency and latency of yawn contagion: kin, then friends, acquaintances, strangers; longer latency in strangers and acquaintances. Gender and nationality did not drive it.
Norscia and Palagi, PLoS ONE, 2011. One year of observation of adults over 16. Only social bonding predicted occurrence, frequency and latency of yawn contagion: kin, then friends, acquaintances, strangers; longer latency in strangers and acquaintances. Gender and nationality did not drive it.
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PLoS ONE. doi:10.1371/journal.pone.0028472 https://doi.org/10.1371/journal.pone.0028472