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Toggle Classification of low IQ subsection. 4.1 Historical. ... Not all report test results as "IQ", but most now report a standard score with a mean score level of ...
Borderline intellectual functioning, previously called borderline mental retardation (in the ICD-8), [1] is a categorization of intelligence wherein a person has below average cognitive ability (generally an IQ of 70–85), [2] but the deficit is not as severe as intellectual disability (below 70). It is sometimes called below average IQ (BAIQ).
An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.
Both dementia and intellectual disability are defined by neurologists as having an IQ that is two standard deviations below median (below about 70, when 100 is the median); the difference between these two classifications for intellectual disability is whether the low IQ represents a lifelong condition (intellectual disability), or a condition ...
Eric Turkheimer and colleagues (2003) found that for children of low socioeconomic status heritability of IQ falls almost to zero. [13] These results have been challenged by other researchers. IQ heritability increases during early childhood, but it is unclear whether it stabilizes thereafter. [14]
Exposure to violence or trauma was correlated with a 7.5-point (SD, 0.5) decrement in IQ and a 9.8-point (SD, 0.66) decrement in reading achievement. [48] Violence may have a negative impact on IQ, or IQ may be protective against violence. [49] The causal mechanism and direction of causation is unknown. [48]
Results showed that the average firstborn had an IQ of 103, compared to 100 for second children and 99 for third children. ... IQ at 11 years was associated with a greater likelihood of using ...
Early IQ tests were also used to argue for limits to immigration to the US. Already in 1917, Goddard reported on the low IQ scores of new arrivals at Ellis Island. Yerkes argued on the basis of his army test scores that there were consistently lower IQ levels among those from Southern and Eastern Europe, which he suggested could lead to a ...
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