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Functional MR imaging of vision in the deaf.

Abstract：

RATIONALE AND OBJECTIVES:Early loss of a sensory modality has been associated with cortical reorganization in both animal models and humans. The purpose of this study was to map visual activation with functional magnetic resonance (MR) imaging and to document possible developmental reorganization in the temporal lobe caused by early deafness. MATERIALS AND METHODS:Six prelingual, profoundly deaf subjects were compared with a similar group of six hearing subjects. Three visual tasks were performed by both groups: attention to movement in the field-of-view periphery, shape matching, and mental rotation. Echo-planar coronal MR imaging was performed at 1.5 T. RESULTS:Regions of interest encompassing the middle and posterior aspects of the superior and middle temporal gyri demonstrated a significantly (P < .05) increased activation in deaf subjects compared with hearing subjects, particularly on the right side (P < .05) and during the tasks involving motion. The most specific effect was noted during the mental-rotation task. CONCLUSION:These results support the hypothesis that portions of the temporal lobe usually involved in auditory processing are more active during certain visual tasks in deaf compared with hearing subjects. Cortical reorganization may be an important factor in the deaf population when considering the physiology of temporal lobe lesions and predicting surgical outcomes. Functional MR imaging may be helpful during preoperative assessment in individuals with deafness.

journal_name

Acad Radiol

journal_title

Academic radiology

authors

Shibata DK,Kwok E,Zhong J,Shrier D,Numaguchi Y

doi

10.1016/S1076-6332(03)80684-0

keywords:

subject

Has Abstract

pub_date

2001-07-01 00:00:00

pages

598-604

issue

7

eissn

1076-6332

issn

1878-4046

pii

S1076-6332(03)80684-0

journal_volume

8

pub_type

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