Laterality refers to the predilection to use one side of the body.
Originating from the French word latéralité , the concept of laterality refers to the predilection that arises spontaneously in a living being to more frequently use the organs found on the right or left side of the body.
In the case of human beings, there is a higher number of right-handers (who use the right side more) than left-handers (privileging the left side). The origin of laterality, however, is not known precisely. Experts believe that it is linked to the fact that the left cerebral hemisphere , which is responsible for exercising control over the opposite side, is predominant.
Among the most frequent symptoms established to indicate laterality in a child are those that affect such important issues as concentration and comprehension or written language. This in turn translates into factors such as lack of self-esteem and insecurity, demotivation, personal and family suffering, anxiety or blockage.
Laterality tests
In order to detect said laterality or simply to be able to check which part of the brain and body predominates in a specific person, there are a series of tests that can be carried out. Among them, for example, the well-known Harris Test stands out, which is based on the person carrying out ten different actions.
Thus, through the development of these activities it will be possible to determine which part of your body is the "preponderant" . Specifically, those are winding a clock, throwing a ball, writing, cutting with a knife, brushing your teeth, hitting with a hammer, stretching a rubber band, cutting with scissors, combing your hair, and turning the knob of a car. door.
However, there are other types of tests that are also used to determine the laterality we are talking about. In this way, we can talk about the Zazzo Test , which is based on the performance of three acts (shooting a ball, dealing some cards, and something related to aiming) or the Bergea Test, which is based on the execution of some activities with the hands like striking a match, unscrewing a plug or trimming.
A tennis player will be right- or left-handed according to laterality.
The cultural influence
The prevalence of the right side, however, is not just a question of biology . Culture is responsible for reinforcing this tendency through various mechanisms.
In our language, for example, the term sinister (which derives from a Latin word that can be translated as "to the left" ) has a negative connotation.
Forced laterality and ambidexterity
If a subject is forced to use the opposite hand to the one he chooses naturally, we are faced with a case of forced laterality .
Lastly, someone who can use both sides of the body with equal skill is known as ambidextrous . This makes the individual able to write with either hand. Ambidexterity , however, is rare and does not imply that ambidextrous people do not exhibit a greater predisposition to use a certain side of their body.