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How Much Can We Boost IQ and Scholastic
Achievement? Harvard Educational Review 1969
A Theory of Primary and Secondary Familial
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associative learning assortative mating average IQ behavior Burt child cognitive components concept correlation differences in intelligence digit span disadvantaged children educational environment environmental factors epistasis estimate evidence fact families Figure free recall gains genes genetic factors geneticists genotypes grade heredity hypothesis individual differences intellectual intelligence tests interaction IQ points IQ range IQ tests Jensen learning ability learning tests Level II ability Level II processes Level II tests low IQs low SES children low SES group lower mean IQ measure mental abilities mental retardation middle-class MZ twins reared Negro normal distribution occupational pairs parents percent persons phenotypic polygenic population pre-school probands programs psychology question racial Raven's Progressive Matrices relatively rote learning sample scale scatter diagram scholastic achievement scholastic performance secondary retardation serial learning siblings social class socioeconomic status SPSSI standard deviation Stanford-Binet studies test scores tion trait values verbal Wechsler