Hemispace differences in the visual perception of size in left hemiParkinson's disease
Hemispace differences in the visual perception of size in left hemiParkinson's disease
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DOI：
10.1016/s0028-3932(02)00285-3
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发表时间：
2003-01-01
期刊：
影响因子：
2.6
通讯作者：
Fowler, MS
中科院分区：
文献类型：
--
作者：
Harris, JP;Atkinson, EA;Fowler, MS
研究了帕金森病（PD）患者对外部空间不同区域大小的视知觉。一组左侧症状（LPD）的患者与一组右侧症状（RPD）的患者进行了比较，并与一组年龄匹配的对照组的相对高度或宽度的判断，两个矩形在不同区域的外部空间。一个矩形的相关尺寸（“标准”）保持不变，而另一个矩形的相关尺寸（“变量”）在恒定刺激的方法中变化。矩形宽度或高度的主观平等点（PSE）通过概率单位分析获得，作为所得心理测量函数的平均值。当标准在左空间时，LPD组的PSE发生在变量较小时，而当标准在右空间时，变量较大时。同样，当标准矩形在上部空间呈现，而变量在下部空间呈现时，当变量较小时发生PSE，这种效果在左空间和右空间都是相似的。在所有这些实验中，对照组和RPD组的PSE没有显著差异，并且接近物理匹配，并且对照组的心理测量功能的斜率比患者更陡，尽管不是显著的。这些数据表明，物体在LPD的左视觉空间和上视觉空间看起来更小，可能是因为右半球受损。(C)2002爱思唯尔科技有限公司。保留所有权利。
The visual perception of size in different regions of external space was studied in Parkinson's disease (PD). A group of patients with worse left-sided symptoms (LPD) was compared with a group with worse right-sided symptoms (RPD) and with a group of age-matched controls on judgements of the relative height or width of two rectangles presented in different regions of external space. The relevant dimension of one rectangle (the 'standard') was held constant, while that of the other (the 'variable') was varied in a method of constant stimuli. The point of subjective equality (PSE) of rectangle width or height was obtained by probit analysis as the mean of the resulting psychometric function. When the standard was in left space, the PSE of the LPD group occurred when the variable was smaller, and when the standard was in right space, when the variable was larger. Similarly, when the standard rectangle was presented in upper space, and the variable in lower space, the PSE occurred when the variable was smaller, an effect which was similar in both left and right spaces. In all these experiments, the PSEs for both the controls and the RPD group did not differ significantly, and were close to a physical match, and the slopes of the psychometric functions were steeper in the controls than the patients, though not significantly so. The data suggest that objects appear smaller in the left and upper visual spaces in LPD, probably because of right hemisphere impairment. (C) 2002 Elsevier Science Ltd. All rights reserved.