Intelligence and giftedness: the contributions of heredity and early environment

Abstract

Part 1 Factors influencing IQ scores among family members: what studies of identical twins tell us about IQ effects of birth order, parental age, and number of siblings on IQ resemblances among family members' IQs how adoption influences IQ. Part 2 Changes in IQ scores over time: evidence that IQ has been rising the black, white IQ disparity - myth and reality. Part 3 Effects of the early home environment on IQ: evaluating tests that measure IQ in infancy and toddlerhood. Part 4 The foundations of intellectual giftedness: successful early educational enrichment programmes accelerating an infant's cognitive development stimulating language comprehension and expression in the early years how Japanese mothering practices heighten spatial structural reasoning ability the nurturing of verbal conceptual reasoning abilities in Jewish families. Part 5 Intellectual giftedness and connections to biology: one brain, two hemispheres, three memory systems types of giftedness unusual biological traits in intellectually gifted people. Part 6 The recent evolution in intelligence and giftedness: the twentieth-century rise in IQ - a discussion of causes toward a new theory of human intellectual Evolution the multi-generational development of intellectual giftedness. Appendix - intelligence and the intra-uterine environment.