Studies have shown that these persons have a shortened life expectancy. The diseases that are usually associated with severe retardation may cause the shorter lifespan
The outlook is not promising for those with severe to profound retardation. Studies have shown that these individuals have a shortened life expectancy.
Mental retardation has different levels. There is Mild intellectual disability; moderate intellectual disability; severe intellectual disability; and Profound intellectual disability.https://www.floridahospital.com/mental-retardation-mr/symptoms-and-signs-mental-retardation
The prognosis for an infant born with holoprosencephaly depends on the severity of the cerebral and other defects. The prognosis for an infant with severe holoprosencephaly is poor; most do not survive past six months, and those that do are likely to suffer profound mental-retardation. At the mild end of the spectrum, where brain development may be nearly normal, a normal life-spanis likely.
Mental retardation occurs in 70-90% of persons with infantile spasms, usually involving severe to profound retardation. Other neurological deficits, such as cerebral palsy, may be seen in about 30-50% of patients.
children with Fukuyama CMD are rarely able to walk, and have severe mental retardation. Most children with this type of CMD die in childhood
The old and still popular terms were adjusted downward from normal- Moron ( high and low grade) Imbecile, and Idiot. for some reason Moron and Idiot remain in popular usage but imbecile, even in slang usage is rarely used.
People can recover from severe degrees of starvation to a normal stature and function. Children, however, may suffer from permanent mental retardation or growth defects if their deprivation was long and extreme.
A cognitive issue.
Is the majority of cases, resulting in the most severe abnormalities. The forebrain fails to divide into lobes, the spinal cord may protrude, combined with profound mental retardation and seizures.
About one-third of individuals with CP have moderate-to-severe mental retardation, one-third have mild mental retardation, and one-third have normal intelligence.
Those who do not die may experience permanent blindness, mental retardation, seizure disorders, or loss of motor control
Mildly retarded people can live alone if necessary and often get married. Profoundly retarded people need caring in their whole life.