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近空间和远空间中的视觉空间忽视:直线二等分与字母删除之间的分离

Visuospatial neglect in near and far space: dissociation between line bisection and letter cancellation.

作者信息

Keller I, Schindler I, Kerkhoff G, von Rosen F, Golz D

机构信息

Neurological Clinic Bad Aibling, Kolbermoorer Strasse 72, 83043 Bad Aibling, Germany.

出版信息

Neuropsychologia. 2005;43(5):724-31. doi: 10.1016/j.neuropsychologia.2004.08.003.

Abstract

The differential performance on a line bisection and a cancellation task in near and far space was studied. A group of 10 patients with severe left-sided visuospatial neglect and a group of 10 right-brain damaged patients without neglect were examined. The stimuli were presented at a distance of 60 cm (near space) and 160 cm (far space), respectively, and corrected for visual angle. In the line bisection task, patients were asked to point to the estimated line centre with a pencil (near space) or a stick (far space). In the cancellation task, patients pointed to all target stimuli they could detect using either a pencil (near space) or a stick (far space). Most patients with left hemineglect showed a more prominent neglect in far space as compared to near space for the line bisection task, whereas no difference of performance between near and far space was found in the control patients. In contrast, no group showed a distance effect in the cancellation task. The observation that only line bisection is influenced by the distance of the stimulus suggests that line bisection and cancellation are processed differentially. It is proposed that line bisection requires an allocentric reference system focusing attention on objects, whereas cancellation tasks are based on an egocentric reference system responsible for visuospatial attention. Our results indicate that distance changes perception within the allocentric but not within the egocentric system.

摘要

研究了近空间和远空间中直线二等分任务和删除任务的差异表现。对一组10名患有严重左侧视觉空间忽视的患者和一组10名无忽视症状的右脑损伤患者进行了检查。刺激分别在60厘米(近空间)和160厘米(远空间)的距离呈现,并校正了视角。在直线二等分任务中,要求患者用铅笔(近空间)或棍子(远空间)指向估计的线段中心。在删除任务中,患者用铅笔(近空间)或棍子(远空间)指向他们能检测到的所有目标刺激。大多数左侧半侧忽视患者在直线二等分任务中,远空间的忽视比近空间更明显,而对照组患者在近空间和远空间的表现没有差异。相反,在删除任务中没有一组表现出距离效应。仅直线二等分受刺激距离影响这一观察结果表明,直线二等分和删除任务的处理方式不同。有人提出,直线二等分需要一个以物体为中心的参照系来将注意力集中在物体上,而删除任务则基于一个负责视觉空间注意力的以自我为中心的参照系。我们的结果表明,距离在以物体为中心的系统中会改变感知,但在以自我为中心的系统中不会。

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