Line bisection in unilateral homonymous visual field defects

被引:16
作者
Schuett, Susanne [1 ]
Dauner, Ruth [2 ]
Zihl, Josef [2 ,3 ]
机构
[1] Univ Durham, Dept Psychol, Sci Labs, Durham DH1 3LE, England
[2] Univ Munich, Dept Psychol, D-80539 Munich, Germany
[3] Max Planck Inst Psychiat, D-80804 Munich, Germany
关键词
Line bisection; Visual field defect; Visual field; Visual-spatial perception; PARIETAL; NEGLECT; ORIGIN; ERROR;
D O I
10.1016/j.cortex.2010.01.008
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
The contralesional line bisection error in unilateral homonymous hemianopia is a frequent but neglected clinical phenomenon. Our knowledge about this bisection error is based on small samples of hemianopic patients. Moreover, horizontal line bisection has never been investigated in other unilateral visual field defects. The present study is the first to examine line bisection in a large, representative sample of patients with unilateral homonymous visual field defects. We investigated horizontal line bisection in 129 patients with left- or right-sided homonymous hemianopia (60.5%), upper and lower quadranopia (24.8%), and paracentral scotoma (14.7%), and determined the magnitude and direction of line bisection error. The contralesional horizontal line bisection error was present not only in patients with hemianopia but also in those with upper or lower quadranopia or paracentral scotoma. Neither the type nor the severity of the visual field defect was found to determine the bisection error. Only the side of the field defect seemed to determine the horizontal direction of the bisection error (left-/rightward). The contralesional bisection error is not a specifically "hemianopic" phenomenon. It is frequently associated with any unilateral homonymous visual field defect, i.e., hemianopia, upper/lower quadranopia, paracentral scotoma. Moreover, our results further support the recent finding that the contralesional bisection error is not a direct consequence of the visual field defect. Yet, they also suggest that, although the visual field defect does not seem to be the primary cause of the contralesional bisection error, it may nevertheless contribute to it. (C) 2010 Elsevier Srl. All rights reserved.
引用
收藏
页码:47 / 52
页数:6
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