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Between 1959 and 1979 the gains were 3 points per decade. Between 1979 and 1989 the increase approached 2 IQ points. Between 1989 and 1998 the gain was about 1.3 points. Between 1998 and 2004 IQ declined by about the same amount as it gained between 1989 and 1998.
"How Much Can We Boost IQ and Achievement?" is a 1969 article by Arthur Jensen published in the Harvard Educational Review. [1] Controversy over the article led to the coining of the term Jensenism , [ 2 ] defined as the theory that IQ is largely determined by genes, including racial heritage. [ 3 ]
In 1987, Flynn published "Massive IQ Gains in 14 Nations: What IQ Tests Really Measure", which found that IQ points in 14 countries, as measured by Raven tests, increased between five and 25 points. [10] Test score increases have been continuous and approximately linear from the earliest years of testing to the present.
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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 ...
The Flynn effect is the increase in average intelligence test scores by about 0.3% annually, resulting in the average person today scoring 15 points higher in IQ compared to the generation 50 years ago. [61] This effect can be explained by a generally more stimulating environment for all people.