He analyzed the photographs taken by the couple when they first married and photographs taken of the couple together 25 years later.
As reported Livescience.com, the results showed that over time, couples will be more similar to each other.
The more unhappy they are, the more likely they have a physical resemblance.
Zajonc estimates that the elderly couple who seemed more like because people will imitate the expression on his friend's face.
In other words, if your spouse has a good sense of humor and lots of laughs, maybe he will develop laugh lines around their mouths - and so is her partner.
Other evidence also shows that men and women the possibility of initially attracted to someone who has the same personality.
In 2006, in one study, scientists at the University of Liverpool asked for volunteers to look at portraits of men and women and assess the personalities of people in the photo.
The participants did not know where the couple live figure in the photographs, but most couples who live together long considered to have the most similar personalities.
The researchers concluded that, "having the personality traits of interest may exist correlation to make the face look attractive."
In a study of twins, scientists from the University of Western Ontario found that study participants tended to choose partners with similar genes; partner of each of identical twins have a higher similarity than pairs of non-identical twins.
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