Animal Models of Mental Retardation
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Children with mental retardation typically show a general developmental delay, whereas in specific developmental disorders, there is a delay in a specific area of behavior, such as reading or speech. According to DSMIII (American Psychiatric Association, 1980,1987), the diagnostic criteria for mental retardation include:
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Significantly subaverage general intellectual functioning, i.e., an IQ of 70 or below on an individually administered IQ test.
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Concurrent deficits or impairments in adaptive functioning, i.e., an individual’s effectiveness in meeting standard expectations in a range of areas, such as social skills and responsibility, communication, daily coping, personal independence, and self-sufficiency.
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| 3. |
An onset before the age of 18, i.e., the mental retardation is manifested during the developmental period.
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