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Direct linkWicherts, Jelte M.; Dolan, Conor V.; Carlson, Jerry S.; van der Maas, Han L. J. – Learning and Individual Differences, 2010
This paper presents a systematic review of published data on the performance of sub-Saharan Africans on Raven's Progressive Matrices. The specific goals were to estimate the average level of performance, to study the Flynn Effect in African samples, and to examine the psychometric meaning of Raven's test scores as measures of general intelligence.…
Descriptors: Intelligence, Academic Achievement, Predictive Validity, Foreign Countries
Wicherts, Jelte M.; Dolan, Conor V.; van der Maas, Han L. J. – Intelligence, 2010
On the basis of several reviews of the literature, Lynn [Lynn, R., (2006). Race differences in intelligence: An evolutionary analysis. Augusta, GA: Washington Summit Publishers.] and Lynn and Vanhanen [Lynn, R., & Vanhanen, T., (2006). IQ and global inequality. Augusta, GA: Washington Summit Publishers.] concluded that the average IQ of the…
Descriptors: International Studies, Intelligence Quotient, Foreign Countries, Psychometrics
Wicherts, Jelte M.; Dolan, Conor V.; Carlson, Jerry S.; van der Maas, Han L. J. – Learning and Individual Differences, 2010
In his comment on our literature review of data on the performance of sub-Saharan Africans on Raven's Progressive Matrices, Lynn (this issue) criticized our selection of samples of primary and secondary school students. On the basis of the samples he deemed representative, Lynn concluded that the average IQ of sub-Saharan Africans stands at 67…
Descriptors: Legislators, Academic Achievement, Intelligence Quotient, Foreign Countries
Vernon, Philip E. – 1969
This book describes recent psychological theories on the nature of intelligence and the influence of environmental factors, and argues that culture and child rearing practices affect the development of abilities (linguistic, sensory motor and perceptual). Studies of intelligence, achievement, and environment in England are discussed, along with…
Descriptors: Academic Achievement, Achievement Rating, Achievement Tests, Blacks
