Self-awareness makes some yawn-susceptible.
References
Platek, S. M., Critton, S. R., Myers, T. E. & Gallup, G. G. Jr. Contagious yawning: the role of self-awareness and mental state attribution. Cognitive Brain Research, 17, 223 - 227, (2003).
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Pearson, H. Kind people catch yawns. Nature (2003). https://doi.org/10.1038/news030728-2
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DOI: https://doi.org/10.1038/news030728-2
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