He strength of the relationships among the resulting subtest and composite residuals was reduced slightly and uniformly, with no different patterns emerging among either the subtests (see Supplementary Tables S6 8) or composites (Supplementary Tables S9 12). The factor analysis results were similarly unaffected (Supplementary Table S13), implying that g does not mask differentiation among the spatial subtests.Univariate genetic analyses. MS023 web intraclass twin correlations are presented in Table 1 for the Bricks composites, and in Supplementary Table S14 for the Bricks subtests and other cognitive measures. These intraclass correlations may be used to calculate initial estimates for the “heritability” (additive genetic influences), “shared environment” (environmental factors promoting similarity) and “non-shared” or “unique environment” (environmental factors not contributing to similarity between twins, and also any measurement error) influencing the trait ee Table 1 for details. The resulting estimates (Table 1) indicate substantial genetic influence on all measures, up to 56 for the Overall Bricks composite. To establish these estimates more precisely, and to obtain model fit statistics and MS023 structure confidence intervals (CIs), the data for each measure were subjected to maximum-likelihood model-fitting to estimate the portions of variance attributable to additive genetic (A), shared environmental (C) and non-shared (unique) environmental components (E, also including measurement error). See Methods for details. The results confirm that all Bricks composites are moderately heritable (Table 2), with no significant differences in the magnitude of the genetic influences between the various functional composites, or between the two dimensional composites. There were substantial non-shared, but no significant shared environmental influences. Results for the individual Bricks subtests and other cognitive measures are presented for reference in Supplementary Table S15. Multivariate genetic analyses. Bivariate correlated factors solutions (see Methods) were fitted to each pair of Bricks composites in turn, from which their phenotypic correlations could be decomposed into the proportions attributable to genetic, shared and non-shared environmental influences. The results (Fig. 2, with precise estimates and CIs in Supplementary Table S16) indicate that the phenotypic correlations are largely (70?0 ) genetic in origin, with the remainder due to non-shared environmental influences. Similar patterns appear between the individual subtests (Supplementary Tables S17 and S18). The correlations between the Bricks composites and theScientific RepoRts | 6:30545 | DOI: 10.1038/srepwww.nature.com/scientificreports/A Rotation Rotation/Visualisation Visualisation 2D 3D Overall Bricks 0.23 (0.03?.40) 0.34 (0.14?.45) 0.43 (0.24?.50) 0.45 (0.27?.52) 0.41 (0.22?.47) 0.55 (0.42?.60) C 0.10 (0.00?.26) 0.05 (0.00?.20) 0.01 (0.00?.16) 0.02 (0.00?.16) 0.00 (0.00?.15) 0.00 (0.00?.11) E 0.67 (0.60?.75) 0.62 (0.55?.69) 0.56 (0.50?.63) 0.53 (0.48?.60) 0.59 (0.53?.66) 0.45 (0.40?.50)Table 2. Univariate model-fitting results. Model-fitting estimates (95 confidence intervals) for additive genetic (A), shared environmental (C) and residual (E; i.e., non-shared environment and error) components of variance. Italicised estimates are non-significant (their confidence intervals include zero).Figure 2. Decomposition of phenotypic correlations. Correlated factor solution analyses, indicating th.He strength of the relationships among the resulting subtest and composite residuals was reduced slightly and uniformly, with no different patterns emerging among either the subtests (see Supplementary Tables S6 8) or composites (Supplementary Tables S9 12). The factor analysis results were similarly unaffected (Supplementary Table S13), implying that g does not mask differentiation among the spatial subtests.Univariate genetic analyses. Intraclass twin correlations are presented in Table 1 for the Bricks composites, and in Supplementary Table S14 for the Bricks subtests and other cognitive measures. These intraclass correlations may be used to calculate initial estimates for the “heritability” (additive genetic influences), “shared environment” (environmental factors promoting similarity) and “non-shared” or “unique environment” (environmental factors not contributing to similarity between twins, and also any measurement error) influencing the trait ee Table 1 for details. The resulting estimates (Table 1) indicate substantial genetic influence on all measures, up to 56 for the Overall Bricks composite. To establish these estimates more precisely, and to obtain model fit statistics and confidence intervals (CIs), the data for each measure were subjected to maximum-likelihood model-fitting to estimate the portions of variance attributable to additive genetic (A), shared environmental (C) and non-shared (unique) environmental components (E, also including measurement error). See Methods for details. The results confirm that all Bricks composites are moderately heritable (Table 2), with no significant differences in the magnitude of the genetic influences between the various functional composites, or between the two dimensional composites. There were substantial non-shared, but no significant shared environmental influences. Results for the individual Bricks subtests and other cognitive measures are presented for reference in Supplementary Table S15. Multivariate genetic analyses. Bivariate correlated factors solutions (see Methods) were fitted to each pair of Bricks composites in turn, from which their phenotypic correlations could be decomposed into the proportions attributable to genetic, shared and non-shared environmental influences. The results (Fig. 2, with precise estimates and CIs in Supplementary Table S16) indicate that the phenotypic correlations are largely (70?0 ) genetic in origin, with the remainder due to non-shared environmental influences. Similar patterns appear between the individual subtests (Supplementary Tables S17 and S18). The correlations between the Bricks composites and theScientific RepoRts | 6:30545 | DOI: 10.1038/srepwww.nature.com/scientificreports/A Rotation Rotation/Visualisation Visualisation 2D 3D Overall Bricks 0.23 (0.03?.40) 0.34 (0.14?.45) 0.43 (0.24?.50) 0.45 (0.27?.52) 0.41 (0.22?.47) 0.55 (0.42?.60) C 0.10 (0.00?.26) 0.05 (0.00?.20) 0.01 (0.00?.16) 0.02 (0.00?.16) 0.00 (0.00?.15) 0.00 (0.00?.11) E 0.67 (0.60?.75) 0.62 (0.55?.69) 0.56 (0.50?.63) 0.53 (0.48?.60) 0.59 (0.53?.66) 0.45 (0.40?.50)Table 2. Univariate model-fitting results. Model-fitting estimates (95 confidence intervals) for additive genetic (A), shared environmental (C) and residual (E; i.e., non-shared environment and error) components of variance. Italicised estimates are non-significant (their confidence intervals include zero).Figure 2. Decomposition of phenotypic correlations. Correlated factor solution analyses, indicating th.