Monthly Archives: July 2013

The Genetics of Intelligence

There were an endless debate about whether IQ heritability was spuriously inflated,rev while the growing evidence, notably from modern techniques (e.g., GCTA), shows a non-negligible heritability in the narrow sense. A large part of the twin method estimpates has been … Continue reading

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Bias in Mental Testing

The scanned version of Jensen’s book, Bias in Mental Testing, can be found here. If the link does not work, just send me an email at mh19870410 @ gmail . com. It is also available in PDF. Bias in Mental Testing … Continue reading

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The IQ Deficit : Disease, Climate, and Evolutionary Causes

(Article last update : January 2015) A widely cited study (Eppig et al., 2010) has suggested that infectious disease is the most important determinant of national IQs, independently and above GDP, education and some evolutionary variables. But their analysis is … Continue reading

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Explaining the Increasing Heritability of Cognitive Ability Across Development: A Meta-Analysis of Longitudinal Twin and Adoption Studies

Explaining the Increasing Heritability of Cognitive Ability Across Development: A Meta-Analysis of Longitudinal Twin and Adoption Studies Daniel A. Briley and Elliot M. Tucker-Drob (2013) See supplemental materials. Abstract Genes account for increasing proportions of variation in cognitive ability across … Continue reading

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The Nature and Nurture of High IQ: An Extended Sensitive Period for Intellectual Development

The Nature and Nurture of High IQ: An Extended Sensitive Period for Intellectual Development Angela M. Brant, Yuko Munakata, Dorret I. Boomsma, John C. DeFries, Claire M. A. Haworth, Matthew C. Keller, Nicholas G. Martin, Matthew McGue, Stephen A. Petrill, … Continue reading

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Heritability of cognitive abilities as measured by mental chronometric tasks: A meta-analysis

Heritability of cognitive abilities as measured by mental chronometric tasks: A meta-analysis A. Alexander Beaujean (2005) Abstract The purpose of this study is to meta-analyze the published studies that measure the performance differences in mental chronometric tasks using a behavioral … Continue reading

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Hollow Flynn Effect in Two Developing Countries and A Further Test of the Debatable Black-White Genetic Differences

Studies of the nature of the Flynn Effect are usually done in developed countries (e.g., Rushton, 1999; Wicherts, 2004; Nijenhuis, 2007; for an ‘Overview of the Flynn Effect’, see Williams, 2013). There are two recent data on two developing countries (Khaleefa, 2009; Liu, 2012). The … Continue reading

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