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The bivariate Cholesky decomposition for musical aptitude and verbal ability, adjusted for general intelligence. A1 and A2 are the additive genetic factors with their pathway estimates; C1, C2, E1 and E2 are the common (C) and unique (E) environmental factors, respectively. Dashed lines indicate non-significant paths. The sample of complete male twin pairs with data available for musical aptitude, verbal ability and general intelligence was n=165.
