"Emotional processes produce vascular changes that are, in part, regulated by facial musculature. The facial muscles are said to act as ligatures on veins and arteries, and they thereby are able to divert blood from, or direct blood to, the brain. An implication of the vascular theory of emotional efference is that habitual use of facial musculature may permanently affect the physical features of the face. The implication holds further that two people who live with each other for a longer period of time, by virtue of repeated empathic mimicry, would grow physically similar in their facial features. Kin resemblance, therefore, may not be simply a matter of common genes but also a matter of prolonged social contact."

R. B. Zajonc, Pamela K. Adelmann, Sheila T. Murphy, and Paula M. Niedenthal:
"Convergence in the physical appearance of spouses: An implication of the vascular theory of emotional efference." Motivation and Emotion, vol. 11. Michigan, 1987

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Symbiotic Ones
2010
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