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PUBMED FOR HANDHELDS

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  • Title: Effects of handedness and sex on the morphology of the corpus callosum: a study with brain magnetic resonance imaging.
    Author: Habib M, Gayraud D, Oliva A, Regis J, Salamon G, Khalil R.
    Journal: Brain Cogn; 1991 May; 16(1):41-61. PubMed ID: 1854469.
    Abstract:
    In view of conflicting data in the existing literature, we examined 53 normal subjects using a handedness questionnaire and callosal area measurements obtained from midsagittal MRI images. The callosum was found to be significantly larger in nonconsistent right-handers (NCRH), especially in its anterior half and especially for males. A significant hand x sex interaction, favoring consistent right-handed (CRH) females, was also found for the posterior midbody, a region known to house interhemispheric fibers connecting the right and left posterior association cortices. These results (1) confirm Witelson's (1985) first findings on postmortem specimens; (2) validate a dichotomy between CRH and NCRH rather than simply considering the writing hand, as was the case in most other similar studies; and (3) suggest that at least two different sex-related--probably hormonal--factors may be acting during the callosal development, one explaining the larger anterior half in NCRH males and the other the larger posterior midbody in CRH females.
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