I dress from, arrives, the human brain the aspect remembers of one nut: as her, he presents two rounded halves, of surface convoluta and connected by the center (It Figures 3-1). These two halves are called " left hemisphere " and " right hemisphere ".


" Any creative act implies ... a new innocence of perception, liberated of the cataract of accepted beliefs. "
Arthur Koestier
The Sieepwaikers


The nervous human system is connected to the brain by means of a crossed connection, so that the right hemisphere controls the left side of the body, and the left hemisphere controls the right side. If an injury is suffered in the left side of the brain, the most affected part of the body will be the right, and vice versa. Because of this crossing of the nervous routes, the left hand is regulated by the right hemisphere, and the right hand by the left hemisphere, as are indicated in the Figure 3-2.

Fig. 3-2. The crossing connection between the right hand and the left hemisphere, and the left hand and the right hemisphere.

First of all to indicate that the functional differences between hemispheres are minimal and only in some few areas could have found differences as for functioning and these not in all the persons. The difference of competitions between both cerebral hemispheres seems to be a sole right of the human being. It has been said that our brains have specialized themselves thus, because the language and the logic need more tidy and sophisticated processes of thought that those that the spatial orientation needs, for example. It treats itself simply that both halves of the brain are complementary. In the majority of the adults, the centers of the speech are placed in the left side. Nevertheless, about 15 % of the left-handed ones and 2 % of those who use preferably the right hand, have centers of the speech in both parts of the brain. Anyhow, left-handed some of them develop the speech in the left hemisphere only; they have less than the half in the right part. Even if the right side of the brain controls principally the left side of the body, and the left side of the brain controls, largely, the right side of the body, the fact of being ambidextrous indicates that both halves of the brain have not managed to be so completely specialized since it to be in the skillful individuals. In the children of short age, every side of the brain possesses, in power, the faculty of the speech and of the language. An injury in the left side in the first years of life, gives like proved the development of the faculty of the language in the right side of the brain. The domain of the speech and probably also of other powers it is established firmly in one of the hemispheres about ten years of age and cannot be transmitted to other one later. The brain processes the sensory information, homeostáticas controls and coordinates the movement, the behavior and the corporal functions, as the beatings of the heart, the blood pressure, the balance sheet of fluids and corporal temperature. The brain is responsible for the cognition, the emotions, the creativity, the memory and the learning. The capacity of processing and storage of a human standard brain overcomes even to the best computers nowadays.