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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.
IQ Range ("deviation IQ") IQ Classification 140+ Very gifted or highly advanced 130–140 Gifted or very advanced 120–129 Superior 110–119 High average 90–109 Average 80–89 Low average 70–79 Borderline impaired or delayed 55–69 Mildly impaired or delayed 40–54 Moderately impaired or delayed
IQ scores can vary for the same person, 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. [20]) Pupil KABC-II WISC-III WJ-III Asher: 90: 95: 111 Brianna: 125: 110: 105 Colin: 100: 93: 101 ...
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.
High heritability of a trait, consequently, does not necessarily mean that the trait is not very susceptible to environmental influences. [8] Heritability can also change as a result of changes in the environment, migration, inbreeding , or how heritability itself is measured in the population under study. [ 9 ]
The Bell Curve: Intelligence and Class Structure in American Life is a 1994 book by the psychologist Richard J. Herrnstein and the political scientist Charles Murray in which the authors argue that human intelligence is substantially influenced by both inherited and environmental factors and that it is a better predictor of many personal outcomes, including financial income, job performance ...