People whose functions of both hands are equally expressed are called ambidexters (Latin ambi - both, dexter - right). Usually this phenomenon manifests itself in early childhood, the total number of people with ambidexterity is about 0.4% of the total population of the planet. Of these, 1% of people have innate ambidexterity, the rest have ambidexterity - an acquired skill.
How ambidexterity manifests itself
Ambidexterity is observed not only in humans, but also in animals. In this state, both hemispheres of the brain are equally developed and, as a result, both hands in a person are equally developed in terms of functionality. For the most part, ambidexterity is an acquired feature, it is more common when left-handers begin to retrain, the left hemisphere of the brain is actively involved in the work, and the child becomes an abidexter - he begins to write with his right hand, without losing his left-handed skills. This ability can also be acquired through prolonged conscious training - the hand is trained, the right hemisphere of the brain works more actively (or the left, if the left-hander has decided to consciously become an ambidexter).
There are many tests that determine what percentage a person is right-handed or left-handed. So, people who listen with their left ear or pick up the phone in their left hand are not 100% right-handed, and therefore, in a sense, almost all of us can be called ambidexter.
Features of ambidextrous children
Since both hemispheres of the brain are equally developed in ambidexters, they make decisions much faster, assess the situation and are in many ways superior to ordinary people. But in childhood, ambidexters need more care, since the equally developed hemispheres of the brain become the cause of language difficulties, hyperactivity syndrome. Such children are worse given exact sciences, timely support and additional activities allow the child to catch up with classmates, usually by the age of 10-12 this unpleasant feature passes. If the child does not find adequate support, ambidexterity can lead to mental retardation.
Reasons for ambidexterity
The most plausible theory of ambidexterity, like left-handedness, is Geodakian's. The scientist conducted research and found that similar phenomena are more often observed in twins, premature and weakened children. The right hemisphere of the brain, which controls the left hand, is inherently dominant, but the left one is capable of developing much more intensively and, under optimal conditions for the development of the embryo, first catches up and then surpasses the right one in terms of development. In cases where the fetus experiences hypoxia, there are other unfavorable factors, the development of the left hemisphere is inhibited and, as a result, the child is born left-handed or ambidextrous. In 2008, the gene for left-handedness was discovered, but there is no exact data that all left-handers and ambidexters, without exception, have this genetic feature.
The human brain is unique, it is able to redistribute loads and, if necessary, take on additional tasks. A person at any age can acquire the skill of ambidexterity, a vivid example of this is the ten-finger printing method, partly ambidexterity skills are developed by pianists. In the case of an injury to the right hand, anyone quickly learns to use the left hand, first for routine tasks, and then for high-precision motor skills.