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Mimic, genetic inheritance

Mimic, genetic inheritance

The way we smile or frown when we are upset we received it as a genetic inheritance from parents. This phenomenon has been observed by everyone: children have expressions of the face similar to those of their parents, reports the Polish daily Rzeczpospolita.

The way we smile or frown when we are upset we received it as a genetic inheritance from parents. This phenomenon has been observed by everyone: children have expressions of the face similar to those of their parents, reports the Polish daily Rzeczpospolita.
When they are upset, focused or happy, sons and daughters clap their mouths or swell their cheeks just like their fathers and mothers. How is this happening? Many scientists have previously believed that these characteristic grimaces are learned when we live with our parents. Israeli researchers have shown that the explanation is different: parental grime is inherited biologically. When we come into the world, they are already encoded in us.


Scientists from the University of Haifa analyzed 21 families, who were not randomly chosen and who shared that in each of them there is a blind person at birth. The researchers held discussions with the blind, during which time the faces of the interlocutors reacted with sadness, anger, joy, concentration, surprise and aversion.
Similar discussions were held with relatives of the blind. It turned out that the mimicry of the girls of the blind during the talks was the same as that of their relatives. Of course, the blind could not learn these expressions by observing the older members of their families or by touching the faces of these relatives. As Israeli researchers write, blind people permanently touch other people's faces only in Hollywood movies.
People who do not see that touching other people's girls is very unpleasant. Since the blind could not learn specific grunts either through the sight nor through the hearing, there is still an explanation: they were born with the ability to take these expressions of the girl and not others.
In the study published in the latest issue of the journal "Proceedings of the National Academy of Sciences", Israeli researchers established that expression changes of the human face are biologically determined to the highest degree. They appreciated and compared the activity of the different muscles of the face in the case of certain grimaces observed in the blind and their relatives. It has been proven that the most durable expression in our genes is that of fear. We inherit it biologically in a proportion of 75%. To a lesser extent genes of surprise (69%), aversion (66%), joy (60%), sadness (59%) and concentration (54%) are determined by genes.
The genes also influence the frequency with which certain changes of the face appear on our faces, therefore how lively our mimicry is. The fact that the face mimic is biologically inherited was known before. All people, regardless of the culture in which they grew up, laugh and grieve in a similar way. The expressions of the face close to the human face also appear in primates. In the research described above, however, it is about more subtle graces, characteristic only to members of a single family. The disposition for the expression by mimic of the face of certain states is linked, as previous research has shown, to a special construction of the muscles and nerves of the face.
A characteristic example of the differences of mimicry that express the same type of emotion is given by the two ways of smiling. The first, called Duchenne's smile, consists of raising the corners of the mouth and contracting the muscles around the eyes. The second way is that which is limited only to the raising of the corners of the mouth. A characteristic detail of the smile are the holes in the cheeks. They appear as a result of increased activity of the upper lip lifting muscle. These are just two examples, because there are several individual differences in the activity of the different muscles and that is why the smiles differ so much. The same is true of grimaces that express other emotions.
The expressions of the face are some of the essential data because we differentiate people between them - they are one of the pillars of our individuality, concludes the author of the article.
Source: Rompres