Original sentence: A 2004 study by Richard Lynn and Marian Van Court returned similar results, with the genotypic decline measuring at 0.9 IQ points per generation for the total sample and 0.75 IQ points for whites only.Demographic studies generally indicate that the more intelligent and better educated women in affluent nations have much lower reproductive rates than the less educated, which has led to concern regarding the future of intelligence in these nations.Discussing these effects, Science reporter John Horgan concludes "The Flynn effect highlights the vital (if mysterious) role that culture plays in intelligence, at least as it is measured by IQ tests.For example with Raven's Progressive Matricies "People tested in 1992 scored 27 points higher on average than people of the same age had scored in 1942".In contradiction with this finding is the "Flynn Effect", based upon the fact that "performance on IQ tests has increased with each generation".In his book Shockley on Eugenics and Race, Shockley claims that this process occurs because the most intelligent actually reproduce least leaving the population less able to perform higher functions.It also suggests that, contrary to The Bell Curve, environmental interventions may close the gaps in IQ scores between different groups.Nobel Prize winner William Shockley has put forward the theory that the average individual in a civilization may eventually become weaker through the process of dysgenics.Shockley further claims that the high population growth rate of blacks and intermarriage between blacks and other races are likely to cause another global societal collapse, due to their lower IQs (see Race and intelligence).The most cited work is Vining's 1982 study on the fertility of 2,539 U.This effect is presently being observed in almost every country on earth in a process known as the Demographic-economic paradox.women aged 25 to 34; the average fertility is correlated at -0.86 in IQ for white women and -0.96 for black women, and indicated a drop in the genotypic average IQ of 1.6 per generation for the white population and 2.4 points per generation for the black population