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Yawn Contagion and Empathy in Homo sapiens

Figure 1

Contagion occurrence as a function of social bond.

Model-estimated value of contagion (marginal means, Y axis), for each value of the main effect (social bond, X axis). Bars show the 95% upper confidence interval (95% CI) for the marginal means. GLMM (AICc = 2272.933; n = 480). Social bond categories: 0 = strangers; 1 = acquaintances; 2 = friends; 3 = kin with r≥0.25 and life partners).

Figure 1

doi: https://doi.org/10.1371/journal.pone.0028472.g001