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Lytton, Hugh; And Others – 1987
A longitudinal investigation of the social and cognitive development of male twins was conducted when twins were 2.5 years of age, and again when they were 8- to 10-years-old. This study was designed to re-examine the heritability of the traits studied at the earlier age and, thus, to address the question of the stability of genetic determination.…
Descriptors: Child Rearing, Cognitive Development, Family Relationship, Foreign Countries
