Brain (A)Symmetry in Monozygotic Twins

Abstract excerpt

Origin and ontogenesis of human brain laterality are unknown. Using in vivo magnetic resonance morphometry we measured cerebral hemispheric asymmetry of the planum temporale, a structural substrate of functional laterality, in pairs of monozygotic twins concordant or discordant for handedness. In both groups, intraclass (i.e., within twin pair) correlations were low. The right-handers showed leftward asymmetry...