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Originating in the French word latéralité, the concept of laterality refers to the predilection born spontaneously in a living being to use more frequently the organs found in the right side or in the left side of the body.

In the case of human beings, there is a higher number of right handed (who use the right side more) than left handed (privilege 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 the predominant one.

Among the most frequent symptoms that are established that 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.

To be able to detect this laterality or simply to be able to verify which part of the brain and body is the one that predominates in a particular person there are a series of tests that can be carried out. Among them, for example, the well-known Harris Test is based on the fact that it carries out ten different actions.

Thus, through the development of these activities, it can be determined that 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, tensing a rubber band, cutting with scissors, combing and turning the knob of a door.

However, there are other types of tests that are also used to determine the laterality we are talking about. In this way, you can talk about the Zazzo Test that supports the performance of three acts (hitting a ball, dealing some cards and one related to the aim) or the Bergea Test that is based on the execution of some activities with the hands like lighting a match, unscrewing a plug or trimming.

The prevalence of the right side, however, is not just a matter of the biology . The culture It is responsible for reinforcing this trend through various mechanisms: in our language, for example, the term sinister (which derives from a Latin word that can be translated as "on the left" ) has a negative connotation.

If a subject is forced to use the opposite hand to the one he chooses naturally, we are facing a case of forced laterality .

It is known as ambidextrous On the other hand, who can use both sides of the body with the same ability. This makes the individual able to write with either hand. The ambidexterity In any case, it is unusual and does not imply that ambidextrous people do not exhibit a greater predisposition to use a certain side of their body.

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