Mental retardation is a condition in which a person a significant decrease in intellectual abilities, so he needs the care and maintenance of any other person, as well as special training. This condition is also called dementia (mental deficiency), and people with mental retardation is mentally defective person. In accordance with iq, this condition can be classified as mild mental retardation (IQ = 50-70), from medium to high (IQ = 20-50), as well as the deep (IQ of less than 20). People, suffering from a slight delay of mental development, often can well adapt to life after they have received the appropriate education and special support. People with moderate or severe mental retardation to adapt to the life you want is a big help, and most often they still remain dependent on other people; for patients with profound mental retardation requires continuous monitoring and attention.