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(Formerly
known as Herbal Specialities Limited) |
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CAUSES
OF MENTAL DEFICIENCY
From the aspect of etiology, the mentally deficient
are classified into prenatal onset, perinatal
onset, and postnatal onset.
Prenatal causes include chromosomal disorder,
inborn error of metabolism, development disorders
of brain formation, and other errors of development.
Perinatal causes include intrauterine disorders
and neonatal disorders.
Postnatal causes include head injuries,
infections, degenerative disorders, malnutrition
and environmental deprivation.
IQ OF MENTALLY DEFICIENT CHILDREN :
Children with mental deficiency are classified
in terms of limitation in adaptive behaviour closely
related with mental age or intelligence quotient
(IQ). An IQ score of 70 or below denotes mental
deficiency.
| CLASSIFICATION |
| IQ
between 55-70 |
Mild |
| IQ
between 40-54 |
Moderate |
| IQ
below 40 |
Severe |
The
above classification is indicative only, as it
is based on individually administered test of
general intelligence, and each test reflects the
constructor's view of intelligence.
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