Nonconscious Mimicry
Empathy
Egoism and Altruism
Facial Feedback Hypothesis
Altruism
Sleep-Wake Cycles
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Updated: Feb 26, 2026

A Laboratory Method to Measure Contagious Yawning in Rats
Published on: June 14, 2019
Jorg J M Massen1, Andrew C Gallup2
1Department of Cognitive Biology, University of Vienna, Austria.
The link between contagious yawning and empathy remains unclear. Current evidence is inconsistent, suggesting more rigorous research with objective measures is needed to confirm any association.
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