Theory 53/Yawning/Threshold lens
Contagion Needs Closeness
The claim
Contagious yawning occurs above a threshold in social closeness, so the same yawn spreads among kin and not among strangers.
01Mechanism
Contagion is linked to social bonding; the threshold reflects the strength of the association rather than visual exposure.
02Prediction
Contagion should track closeness.
03Refutation
Contagion tracking exposure would remove the social term.