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Cerebral Cortex, Vol. 12, No. 7, 749-755, July 2002
© 2002 Oxford University Press

The Epigenesis of Planum Temporale Asymmetry in Twins

Mark A. Eckert, Christiana M. Leonard, Elizabeth A. Molloy1, Jonathan Blumenthal1, Alex Zijdenbos2 and Jay N. Giedd

Department of Neuroscience, McKnight Brain Institute of the University of Florida, Gainesville, FL 32610, , 1 Child Psychiatry Branch, National Institute of Mental Health, Bethesda, MD 20892, USA and , 2 Montreal Neurological Institute, McGill University, Quebec, Canada

Mark Eckert, PO Box 100244, Department of Neuroscience, University of Florida McKnight Brain Institute, Gainesville, FL 32610, USA. Email: eckert{at}ufl.edu.

Variation in hemispheric asymmetry of the planum temporale (PT) has been related to verbal ability. The degree to which genetic and environmental factors mediate PT asymmetry is not known. This study examined the heritability for planar asymmetry in 12 dizygotic (DZ) and 27 monozygotic (MZ) male twin pairs who were between 6 and 16 years of age. There was weak but positive evidence for heritability of planar asymmetry. Co-twin similarity for planar asymmetry and Sylvian fissure morphology increased when excluding twins discordant for writing hand and when excluding twins exhibiting birth weight differences >20% from the analyses. Birth weight differences were also related to twin differences in total cerebral volume, but not central sulcus asymmetry. These results suggest that exogenous perinatal factors affect the epigenesis of planar asymmetry development.


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