Abstract
The present study examined the relationship between dichotic listening performance and handedness in twins. The 53 monozygotic (MZ) and 35 dizygotic (DZ) pairs concordant for right-handedness displayed ear asymmetries and total correct scores comparable to those found in right-handed singletons. The left- and right-handed members of the 19 MZ and 8 DZ pairs discordant for handedness were also similar to left- and right-handed singletons, respectively, with regard to ear asymmetry and overall performance. These data demonstrate that the relationship between handedness and brain organization observed in both MZ and DZ twins is similar to that found in the singleton population. The pattern of intraclass correlations obtained suggests that handedness discordance may be associated with greater differences in ear asymmetry within MZ pairs than within DZ pairs, possibly reflecting differences in the etiology of discordance for handedness in the two groups. In contrast, MZ cotwins were more similar than DZ cotwins, regardless of handedness, when total correct performance was measured.
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