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The morphometry of auditory cortex in the congenitally deaf measured using MRI.

Abstract：

:The study of congenitally deaf individuals provides a unique opportunity to understand the organization and potential for reorganization of human auditory cortex. We used magnetic resonance imaging (MRI) to examine the structural organization of two auditory cortical regions, Heschl's gyrus (HG) and the planum temporale (PT), in deaf and hearing subjects. The results show preservation of cortical volume in HG and PT of deaf subjects deprived of auditory input since birth. Measurements of grey and white matter, as well as the location and extent of these regions in the deaf showed complete overlap both with matched controls and with previous samples of hearing subjects. The results of the manual volume measures were supported by findings from voxel-based morphometry analyses that showed increased grey-matter density in the left motor hand area of the deaf, but no differences between the groups in any auditory cortical region. This increased cortical density in motor cortex may be related to more active use of the dominant hand in signed languages. Most importantly, expected interhemispheric asymmetries in HG and PT thought to be related to auditory language processing were preserved in these deaf subjects. These findings suggest a strong genetic component in the development and maintenance of auditory cortical asymmetries that does not depend on auditory language experience. Preservation of cortical volume in the deaf suggests plasticity in the input and output of auditory cortex that could include language-specific or more general-purpose information from other sensory modalities.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Penhune VB,Cismaru R,Dorsaint-Pierre R,Petitto LA,Zatorre RJ

doi

10.1016/S1053-8119(03)00373-2

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

1215-25

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053811903003732

journal_volume

20

pub_type

临床试验,杂志文章

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