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Early twin studies of adult individuals have found a heritability of IQ between 57% and 73%, [7] with some recent studies showing heritability for IQ as high as 80%. [8] IQ goes from being weakly correlated with genetics for children, to being strongly correlated with genetics for late teens and adults.
The general figure for the heritability of IQ, according to an American Psychological Association report, is 0.45 for children, and rises to around 0.75 for late adolescents and adults. [14] Heritability measures for g factor in infancy are as low as 0.2, around 0.4 in middle childhood, and as high as 0.9 in adulthood.
The aforementioned earring example quoted by Chomsky is an instance where the opposite is true: high heritability, but not genetic determination. [34] Given that genetic determination and heritability are not equivalent, Block contends that IQ is one such trait that is heritable but not genetically determined.
IQ scores can differ to some degree for the same person on different IQ tests, so a person does not always belong to the same IQ score range each time the person is tested (IQ score table data and pupil pseudonyms adapted from description of KABC-II norming study cited in Kaufman 2009). [12] [13] Pupil KABC-II WISC-III WJ-III Asher: 90: 95: 111 ...
Conducting a study along such lines and therefore retrieving a correspondingly larger national sample, David C. Rowe and colleagues (1999) found not only that achieved education had a high heritability (.68) and that half of the variance in education was explained by an underlying genetic component shared by IQ, education, and SES. [19]
Human intelligence is the intellectual capability of humans, which is marked by complex cognitive feats and high levels of motivation and self-awareness.Using their intelligence, humans are able to learn, form concepts, understand, and apply logic and reason.