INDIVIDUAL VARIATION IN LINE BISECTION - A STUDY OF NORMAL SUBJECTS WITH APPLICATION TO THE INTERPRETATION OF VISUAL NEGLECT

被引:153
作者
MANNING, L [1 ]
HALLIGAN, PW [1 ]
MARSHALL, JC [1 ]
机构
[1] UNIV OXFORD,RADCLIFFE INFIRM,DEPT CLIN NEUROL,NEUROPSYCHOL UNIT,WOODSTOCK RD,OXFORD OX2 6HE,ENGLAND
基金
英国医学研究理事会;
关键词
D O I
10.1016/0028-3932(90)90119-9
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
Investigations of left visuo-spatial neglect are reviewed with special reference to line bisection performance. Attention is then drawn to inconsistencies in the direction and magnitude of transection displacements in group studies of normal controls. We argue that the lack of reliable information about normal mechanisms for line bisection makes it impossible to interpret pathological performance in neglect. Accordingly, we report a case-series of 22 normal young adults, each of whom bisects 10 lines of differing lengths 10 times each. There is very substantial between-subject variation in both the magnitude and direction of the linear regression of transection displacement on line length; there are likewise considerable differences in the magnitude of the linear regression of standard deviation on line length. These two sources of individual variation are uncorrelated. We propose a psychophysical theory of line bisection, and suggest that the basic mechanisms responsible for task-performance are qualitatively intact in visuo-spatial neglect, albeit quantitatively impaired. © 1990.
引用
收藏
页码:647 / 655
页数:9
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