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Familiality of brain‐size corrected grey‐matter volumes. Estimates of intra‐trait (e.g. FL vs. FL) and cross‐trait (e.g. FL–PL) familiality indexed by intra‐class correlation coefficients computed for brother‐brother (left; 38 pairs) and sister‐sister (right; 58 pairs) pairs. F, P, T, and O denote, respectively, Frontal, Parietal, Temporal, and Occipital lobes. L and R denote the Left and Right hemispheres.
