Arm folding

The manner in which a person folds arms is one of the clearest dynamic morphological characteristics by which each person can be assigned to one of two alternative phenotypes. Once adopted, manner of arms folding across the chest does not change throughout the lifetime and persons easily give up the unusual folding position, most commonly at the first attempt. It has been shown that the phenotypes of these properties are distributed independently with left-handed and right-handed people.

If, after arms folding, the right arm is above the left forearm, the phenotype is characterised as R (right; the right type), and in the opposite case, i.e. if the left arm is positioned above the right, it is the phenotype L (left; left-type).