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BEHAVIORAL SCIENCES - Universitatea de Medicină şi Farmacie

BEHAVIORAL SCIENCES - Universitatea de Medicină şi Farmacie

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Even when there are biological factors that contribute to a<br />

problem, the environment usually plays a role as well. Biological<br />

approaches to <strong>de</strong>fining abnormality may encourage people to overlook<br />

environmental factors that are easier to change than genetics or brain<br />

disor<strong>de</strong>rs. A study of adopted children showed that two distinct risk factors<br />

encouraged alcoholism: (1) familial alcoholism (one or both genetic<br />

parents were alcoholic) and (2) drinking in the family environment (the<br />

adoptive parents had drinking problems). Either heredity or environment<br />

could increase risk of alcoholism, and obviously only the environment can<br />

be manipulated or changed after a person is born, if one wants to prevent<br />

alcoholism from <strong>de</strong>veloping.<br />

Specific behavioral disor<strong>de</strong>rs<br />

1. Divi<strong>de</strong>d Brain<br />

This disease is also called split-brain, and the problem the patient<br />

has is that the both brain parts cannot communicate with each other.<br />

The brain has two hemispheres, the right and the left hemisphere.<br />

Those two hemispheres do look like mirror images of each other, but a<br />

closer examination reveals certain asymmetries. When the two<br />

hemispheres are measured during an autopsy, the left one is almost always<br />

larger than the right one. This anatomical difference are related to<br />

differences in functions between the two hemispheres: the left hemisphere<br />

is specialized for the use of language, while the right one is specialized for<br />

mental imagery and the un<strong>de</strong>rstanding of spatial relationships.<br />

Speech and the production of sounds are usually located in the left<br />

hemisphere. But some left-han<strong>de</strong>d people have speech centers located in<br />

the right hemisphere or divi<strong>de</strong>d between the two. Seeing is also<br />

complicated, the two eyes of you give their information to the opposite<br />

hemisphere; your right eye gives his information to the left hemisphere,<br />

and your left eye to the right hemisphere. The brain transforms this<br />

information so we see 'normal'. As a result of this the left hemisphere sees<br />

the right hand in the right visual field, this is correct because your right<br />

hemisphere controls you left body-half and otherwise. When someone is<br />

suffering a split-brain his both hemispheres cannot communicate. In a test,<br />

a person with a split brain is seated in front of a screen. Because of his<br />

split brain he cannot use his right hand to take something he sees with his<br />

left eye. When a word appears on the left si<strong>de</strong> of the screen, the eye passes<br />

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