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Asymmetry of subinsular anisotropy by in vivo diffusion tensor imaging

โœ Scribed by Yue Cao; Stephen Whalen; Jie Huang; Kevin L. Berger; Mark C. DeLano

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
405 KB
Volume
20
Category
Article
ISSN
1065-9471

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โœฆ Synopsis

Abstract

The cortical regions specialized in speechโ€“language exhibit a leftโ€“right asymmetry, e.g., a larger cortical size in the left auditory cortex and Wernicke's area. The possibility of developmental asymmetry in axonal fibers interconnecting speechโ€“language cortical areas can be investigated by in vivo diffusion tensor imaging. Fifteen rightโ€handed native English speakers showed a markedly significant asymmetry (P < 0. 0005) in the relative anisotropy of water diffusion in the subinsular white matter, greater on the left. Additionally, the first principal diffusivity was greater and the second and third principal diffusivities were smaller on the left than right side. These results suggest the subinsular axonal structures developed differently between the left and right sides. A possible association between the hemispheric specialization in language and speech and the subinsular axonal fiber development is discussed. Hum. Brain Mapp. 20:82โ€“90, 2003. ยฉ 2003 Wileyโ€Liss, Inc.

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