BIG ENCYCLOPEDIA FOR CHILDREN AND ADULTS
Who is called a mentally retarded child? Detailed answer Directory / Big encyclopedia. Questions for quiz and self-education Did you know? Who is called a mentally retarded child? A person whose mental development stops before it reaches the normal level for people is called mentally retarded. Mental retardation, or dementia, cannot be regarded as a specific disease. Rather, it is just a sign, or, as doctors say, a symptom of an illness or that not everything is in order in the body. Dementia can have different causes, and not all of them are well understood. But this phenomenon should make itself felt before the age of seventeen, when the mental development of a person basically ends. Although there is no consensus among experts on this issue, most believe that a person’s mental abilities can be measured using special tests. The results of this test of mental development are expressed in the so-called indicator of mental development, or the coefficient of giftedness, which in a normally developed average person is considered equal to 100. A person whose IQ is below 70 and who is unable to cope independently with the problems of daily life is considered demented. There are four degrees of mental retardation: minor, moderate, major and profound. The index of mental development in the severely and profoundly retarded falls below the mark of 35. Their mental abilities are not higher than those of normal five-year-old children. They cannot serve themselves and are unable to protect themselves from danger. Someone has to keep an eye on them all the time. With moderate and slight retardation, there are fewer problems. They can learn to perform simple tasks by working in special workshops. They have difficulties with reading, writing and arithmetic, but they are able to master most of the primary school subjects. Mental retardation can be caused by various reasons, among which are diseases of the mind and body, and even the difficult conditions in which the child lives. Scientists have established about two hundred factors that contribute to the development of dementia. These include birth trauma, brain tumors, blood disorders, infectious diseases caused by certain viruses, and various types of congenital dementia. Author: Likum A. Random interesting fact from the Great Encyclopedia: Which woman gave rise to the immortal cell line? In 1951, American Henrietta Lacks was diagnosed with cervical cancer and died the same year. Doctors at the hospital took samples of healthy and diseased tissue from her, which came to the researcher George Gay. He discovered a previously unknown phenomenon: Lux's tumor cells were able to survive and divide countless times. They pioneered the HeLa cell line, which has been used to develop a polio vaccine in cancer, HIV, radiation exposure, and a host of other trials by scientists around the world. It is estimated that more than 20 tons of HeLa cells have been grown since then, which exceeds Henrietta's weight in life by 400 times.
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