Abstract
Only the most hidebound or ideologically driven can still maintain that genetic variation has a negligible impact on general mental ability (e.g., Bouchard, Lykken, McGue, Segal, & Tellegen, 1990; Plomin, DeFries, & McClearn, 1990). Nevertheless, the specific mechanisms by which genes shape and are manifested in brain structure and function have remained elusive. Impediments to progress have included the absence of good animal models and the multifactorial nature of intelligence. Multifactorial inheritance implies multiple genetic and environmental influences so that no single gene, whether regulatory or structural, can dominate IQ variance in the normal range. Identifying individual genes with only modest effects on intellectual function is daunting, but as new techniques from molecular biology become applicable to human intellectual variation (McClearn, Plomin, Gora-Maslak, & Crabbe, 1991), rapid progress can be expected. Until now, most human behavior geneticists necessarily have relied on low-tech methods like twin and adoption designs for untangling genetic and environmental influences on intelligence. However, even these low-tech procedures have provided a remarkably convergent body of findings over the years.
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Willerman, L., Schultz, R., Rutledge, J.N., Bigler, E.D. (1994). Brain Structure and Cognitive Function. In: Reynolds, C.R. (eds) Cognitive Assessment. Perspectives on Individual Differences. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9730-5_2
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