Criticism
Lynn's review work on global racial differences in cognitive ability has been cited for misrepresenting the research of other scientists, and has been criticized for unsystematic methodology and distortion.
Many of the data points in Lynn's book IQ and the Wealth of Nations were not based on residents of the named countries. The datum for Suriname was based on tests given to Surinamese who had emigrated to the Netherlands, and the datum for Ethiopia was based on the IQ scores of a highly selected group that had emigrated to Israel, and, for cultural and historical reasons, was hardly representative of the Ethiopian population. The datum for Mexico was based on a weighted averaging of the results of a study of "Native American and Mestizo children in Southern Mexico" with results of a study of residents of Argentina.
The datum that Lynn and Vanhanen used for the lowest IQ estimate, Equatorial Guinea, was the mean IQ of a group of Spanish children in a home for the developmentally disabled in Spain. Corrections were applied to adjust for differences in IQ cohorts (the "Flynn" effect) on the assumption that the same correction could be applied internationally, without regard to the cultural or economic development level of the country involved. While there appears to be rather little evidence on cohort effect upon IQ across the developing countries, one study in Kenya (Daley, Whaley, Sigman, Espinosa, & Neumann, 2003) shows a substantially larger cohort effect than is reported for developed countries (p.?)
In a critical review of The Bell Curve, psychologist Leon Kamin faulted Lynn for disregarding scientific objectivity, misrepresenting data, and for racism. Kamin argues that the studies of cognitive ability of Africans in Lynn's meta-analysis cited by Herrnstein and Murray show strong cultural bias. Kamin also reproached Lynn for concocting IQ values from test scores that have no correlation to IQ. Kamin also notes that Lynn excluded a study that found no difference in White and Black performance, and ignored the results of a study which showed Black scores were higher than White scores.
Journalist Charles Lane criticized Lynn's methodology in his New York Review of Books article "The Tainted Sources of 'The Bell Curve'" (1994), to which then Pioneer Fund president Harry F. Weyher replied.
Read more about this topic: Richard Lynn
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