لخّصلي

transferred to the other by way of a broad network of connecting nerve fibers called the corpus callosum. This connecting bridge can cause a problem in some forms of epilepsy, because a seizure starting in one hemisphere may cross over and trigger a massive discharge of neurons in the other. In order to prevent such seizures in some severe epileptics, neurosurgeons have surgically severed the corpus callosum.
Figure 1 shows the evident differences between the two hemispheres as the sensory inputs appear. With the eyes fixed straight ahead, stimuli to the left of the fixation point go to the right cerebral hemisphere, and stimuli to the right go to the left hemisphere. The left hemisphere controls the movements of the right side of the body, and vice versa. The left hemisphere controls written and spoken language and mathematical calculations. The right hemisphere can understand only simple language and its main ability seems to involve spatial construction and pattern sense [1].
In the normal brain, stimuli entering one hemisphere are rapidly communicated to the other, by way of the corpus callosum, and so the brain functions as a unit. Roger Sperry was interested in split brain persons and he developed several researches in neuroscience. In one of Sperry’s test situations, a person who has undergone a split-brain operation is seated in front of a screen that hides his hands from view [4].
First, the word „nut” is flashed briefly on the left part of the screen. With his left hand, the person can easily pick up the nut from a set of objects hidden from his view. At the same time, he can’t tell the experimenter what word flashed on the screen since the speech is controlled by the left hemisphere and the visual image of the concept was not transmitted to that hemisphere. When he was questioned, he seemed unaware of what his left is doing. One possible „solution” is that the word should be flashed on the screen for more than one-tenth of a second. This way, the subject can move his eyes so that the word is also projected to the left hemisphere. If the split-brain person can move his eyes freely, information goes to both cerebral hemispheres, and this is one reason for which deficiencies caused by severing the corpus callosum are not readily apparent in a person’s daily activities.
This experiment can only prove that the two hemispheres work dependently of each other. They differ in their specializations, but they integrate their activities at all times. Together, the two halves represent an amazing human computer, which processes continuously data, stimuli, representations and emotions. At the same time, a fact is that logical analysis represents only a part of the brain’s activity as data processing [3]. After the inputs have been processed at a conscious level, they are transferred to the unconscious mind, which has different mechanisms of data processing. The unconscious re-evaluates the passed experiences of a person, memorizes them, analyzes them and offers solutions to the conscious level. Today’s people, being so rationalists, block their unconscious availabilities and this usually leads toward physical or psychological suffering. It is as if they have learned how to constantly have personal boundaries, because this represents normality. Psychotherapy unblocks these boundaries and allows the patient to learn how to be more flexible and creative, working with one’s own unconscious resources. This takes time, naturally, but the results are really revolutionary.
I have noticed [2], among students, the same self-limitation and unhappiness and this fact tends to become a real threat to their personal development and to the academic environment as well. Negative emotions come to the surface, both for students and academics, and this can only affect the goals of the educational process. Professors complain about the youngsters as being way too lazy and passive, students blame teachers for their lack of interest in school. It would be much easier for both parts to take into consideration the idea of working with the unconscious potential. People are betrayed by their emotions, as hard as they might fight to repress them. Since we are humans, it is not shameful to reveal emotions, but at the same time emotions can affect our performances – at work or in relationships. Therefore, future researches will focus more on the implications that the human brain’s function has upon emotions.