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Cerebral lateralization of face-selective and body-selective visual areas depends on handedness.
- Source :
-
Cerebral cortex (New York, N.Y. : 1991) [Cereb Cortex] 2010 Jul; Vol. 20 (7), pp. 1719-25. Date of Electronic Publication: 2009 Nov 04. - Publication Year :
- 2010
-
Abstract
- The left-hemisphere dominance for language is a core example of the functional specialization of the cerebral hemispheres. The degree of left-hemisphere dominance for language depends on hand preference: Whereas the majority of right-handers show left-hemispheric language lateralization, this number is reduced in left-handers. Here, we assessed whether handedness analogously has an influence upon lateralization in the visual system. Using functional magnetic resonance imaging, we localized 4 more or less specialized extrastriate areas in left- and right-handers, namely fusiform face area (FFA), extrastriate body area (EBA), fusiform body area (FBA), and human motion area (human middle temporal [hMT]). We found that lateralization of FFA and EBA depends on handedness: These areas were right lateralized in right-handers but not in left-handers. A similar tendency was observed in FBA but not in hMT. We conclude that the relationship between handedness and hemispheric lateralization extends to functionally lateralized parts of visual cortex, indicating a general coupling between cerebral lateralization and handedness. Our findings indicate that hemispheric specialization is not fixed but can vary considerably across individuals even in areas engaged relatively early in the visual system.
- Subjects :
- Adult
Brain blood supply
Brain Mapping
Female
Humans
Image Processing, Computer-Assisted methods
Magnetic Resonance Imaging methods
Male
Oxygen blood
Photic Stimulation methods
Visual Pathways blood supply
Visual Pathways physiology
Young Adult
Brain physiology
Dominance, Cerebral physiology
Face
Functional Laterality physiology
Pattern Recognition, Visual physiology
Subjects
Details
- Language :
- English
- ISSN :
- 1460-2199
- Volume :
- 20
- Issue :
- 7
- Database :
- MEDLINE
- Journal :
- Cerebral cortex (New York, N.Y. : 1991)
- Publication Type :
- Academic Journal
- Accession number :
- 19889713
- Full Text :
- https://doi.org/10.1093/cercor/bhp234