What is mental retardation?

Mental retardation-mental retardation, also known as mental retardation, generally refers to the persistent obstacle of cognitive activities and the obstacle of the whole psychological activities caused by organic damage or incomplete brain development. Mentally retarded ? Due to genetic variation, infection, poisoning, craniocerebral injury, brain malformation or endocrine abnormalities and other harmful factors, the brain of the fetus or baby can not develop normally or incompletely, and the development of intellectual activities stays at a relatively low stage, which is called mental retardation. ? Dementia is called dementia because the brain is damaged by physical, chemical or virus, bacteria and other factors, which damages the original normal intelligence and causes defects.

Mental retardation (or mental retardation for short) refers to the behavioral disorder that needs to use intellectual thinking in general financial management, reading literacy, calculation, daily life and so on. Synonyms also include mental retardation (English: mental retardation, referred to as MR), which refers to the performance of mental retardation in qualifications and abilities, and most of them are the results that can only be obtained through impression or comparison. In the United States, this kind of disorder is usually called "mental retardation", and the relevant international societies that study this field also take "mental retardation" as the official name.

The causes of mental retardation can be divided into congenital and acquired. Congenital mental retardation may be due to chromosomal abnormalities; The acquired cause may be brain injury (such as a car accident) or external stimuli.

Mental retardation is not only a worldwide disease that seriously harms children's physical and mental health, but also a serious social problem. It is estimated that there are about 654.38+0.5 billion people with mental retardation in the world. With the rapid development of society and the increasingly fierce competition for talents, countries pay more attention to intelligence. Researchers have also been exploring the factors that lead to mental retardation in children.

Among them, genetic factors are one of the main causes of severe mental retardation; Secondly, infection during pregnancy is another major pathogenic factor for children with mental retardation, especially in the first three months of pregnancy. In addition, malnutrition during pregnancy is one of the main reasons for intrauterine growth retardation.