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The rise and fall of the Flynn Effect as a reason to expect a narrowing of the Black-White IQ gap
RUSHTON J. Philippe ; JENSEN Arthur R.
In this Editorial we correct the false claim that g loadings and inbreeding depression scores correlate with the secular gains in IQ. This claim has been used to render the logic of heritable g a "red herring" and an "absurdity" as an explanation of Black-White differences because secular gains are environmental in origin. In point of fact, while g loadings and inbreeding depression scores on the 11 subtests of the Wechsler Intelligence Scale for Children correlate significantly positively with Black-White differences (0.61 and 0.48, P<0.001), they correlate significantly negatively (or not at all) with the secular gains (mean r=—0.33, P<0.001; and 0.13, ns, respectively). Moreover, heritabilities calculated from twins also correlate with the g loadings (r=0.99, P<0.001 for the estimated true correlation), providing biological evidence for a true genetic g, as opposed to a mere statistical g. While the secular gains are on g-loaded tests (such as the Wechsler), they are negatively correlated with the most g-loaded components of those tests. Also, the tests lose their g loadedness over time with training, retesting, and familiarity. In an analysis of mathematics and reading scores from tests such as the NAEP and Coleman Report over the last 54 years, we show that there has been no narrowing of the gap in either IQ scores or in educational achievement. From 1954 to 2008, Black 17-year-olds have consistently scored at about the level of White 14-year-olds, yielding IQ equivale
ISSN : 0160-2896 CODEN : NTLLDT
Intelligence (Norwood) A. 2010, vol. 38, n° 2, pp. 213-219 [7 pages]
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