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Hoekstra, Rosa A.; Bartels, Meike; van Leeuwen, Marieke; Boomsma, Dorret I. – Developmental Science, 2009
The etiology of individual differences in general verbal ability, verbal learning and letter and category fluency were examined in two independent samples of 9- and 18-year-old twin pairs and their siblings. In both age groups, we observed strong familial resemblance for general verbal ability and moderate familial resemblance for verbal learning,…
Descriptors: Twins, Verbal Learning, Late Adolescents, Genetics