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Assessment of left unilateral spatial neglect using illusory figures

使用虚幻图形评估左侧单侧空间忽视

基本信息

批准号：
13610107
负责人：
KOYAMA YASUMASA
金额：
$ 1.41万
依托单位：
Tokyo Metropolitan Organization fur Medical Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2004
项目状态：
已结题

项目摘要

Unilateral spatial neglect is the failure to report, respond, or orient to novel or meaningful stimuli presented to the side opposite a brain lesion (Heilman, 1979). Traditionally unilateral spatial neglect is evaluated by using several visual exploration tests, such as the line cancellation task, or the line bisection task. The aim of the present study was to evaluate the new assessment technique using optical illusion. We performed three experiments employing the Wundt-Jastrow illusory figures to investigate the clinical application of this type of test and to evaluate the cognitive functions of the patients with left unilateral spatial neglect In the first experiment, the test was given to the patient with callosal lesion and clarified the attentional aspect of the cognitive function of the patient by using the Wundt-Jastrow Illusory figures. In the next experiment, we recorded the eye movement of this patient during the test His gaze quickly moved to the right side of the figure without substantial leftward search, To investigate precise eye fixation patterns, we performed the third experiment by using line bisection with structured presentation method. The results revealed that the patients were inferred line length mainly from the right endpoint of the stimulus. Through this series of experiments, it implies that the response to the illusory figure in patients with unilateral spatial neglect may reveal overattention to the right side of stimulus. Additional experiments confirmed that representational aspect of the deficit was also affected to these results.

单侧空间忽视是指对呈现在脑损伤对面的新刺激或有意义的刺激没有反应、报告或定向（Heilman, 1979）。传统上，单侧空间忽略是通过使用几个视觉探索测试来评估的，例如线消除任务或线平分任务。本研究的目的是评价利用视错觉的新评估技术。本研究采用Wundt-Jastrow错觉图进行了三个实验，以探讨该测试的临床应用，并评估左单侧空间忽视患者的认知功能。第一个实验以胼胝体病变患者为实验对象，利用Wundt-Jastrow错觉图阐明了患者认知功能的注意方面。在接下来的实验中，我们记录了该患者在测试过程中的眼球运动，他的目光迅速移动到人物的右侧，没有实质性的向左搜索。为了研究精确的眼球注视模式，我们采用线平分结构呈现法进行了第三次实验。结果表明，患者主要从刺激的右端推断线长度。通过这一系列的实验，提示单侧空间忽视患者对虚幻形象的反应可能反映了对刺激右侧的过度关注。另外的实验证实，表征方面的缺陷也受到这些结果的影响。