Mark V W, Kooistra C A, Heilman K M
Department of Neurology, College of Medicine, University of Florida, Gainesville.
Neurology. 1988 Aug;38(8):1207-11. doi: 10.1212/wnl.38.8.1207.
Patients with hemispatial neglect fail to cancel lines distributed on one side of a piece of paper. This defect is thought to be induced by a deficit in the neuronal systems that mediate attention, intention, and exploration toward and in the hemispace contralateral to the lesion. However, an alternate (but not mutually exclusive) interpretation is that the patients are either strongly attracted to or impaired in disengaging from the stimuli occupying the other, non-neglected hemispace. We tested ten patients with neglect on two versions of a cancellation test. In the control test they cancelled lines by drawing over them, and in the experimental test they erased lines. There were significantly more omissions in the drawing-over task than in the erasing task. The improved performance when lines were cancelled by removal instead of by marking them suggests that hemispatial neglect is influenced by the presence of stimuli in the non-neglected hemispace.
患有半侧空间忽视症的患者无法划掉分布在一张纸一侧的线条。这种缺陷被认为是由介导对损伤对侧半空间的注意、意图和探索的神经系统缺陷引起的。然而，另一种（但并非相互排斥）的解释是，患者要么被占据另一个未被忽视的半空间的刺激强烈吸引，要么在脱离这些刺激时受损。我们对10名患有忽视症的患者进行了两种版本的划消测试。在对照测试中，他们通过在线条上划过来划掉线条，而在实验测试中，他们擦掉线条。在线条划过任务中的遗漏显著多于擦除任务。当通过移除而不是标记来取消线条时表现有所改善，这表明半侧空间忽视受到未被忽视的半空间中刺激的存在的影响。
