Kim M, Anderson J M, Heilman K M
Department of Neurology, University of Florida College of Medicine, Veterans Administration Medical Center, Gainesville 32610, USA.
Neurology. 1997 Oct;49(4):936-40. doi: 10.1212/wnl.49.4.936.
BACKGROUND/OBJECTIVE: Neglect has been attributed to sensory-attentional, motor-intentional, and representational disorders. Although patients with neglect may have defective visual exploration, the nature of this exploration deficit has not been entirely elucidated. The purpose of this study is to learn how, compared with control subjects, a patient with neglect performs visual exploration.
The line bisection test is commonly used to detect and evaluate the performance of patients with unilateral or hemispatial spatial neglect. We tested an experimental subject with left premotor-intentional neglect using an infrared eye monitoring instrument. Thirteen right-handed healthy volunteers served as control subjects. From different starting ocular positions, we assessed the direction of eye movements when the subjects initially oriented to the line, scanned the line, and then attempted to look at the center of the line.
Independent of starting ocular position, normal subjects most often initially orient to the left end of the line, scan rightward, then look leftward to the center. However, the eye movements in our experimental subject with neglect were directed to the right end of the line without any scanning or leftward eye movement back to the center of the line.
Our subject with neglect had defective line exploration that may be attributed to a directional ocular motor intentional deficit.
背景/目的：忽视被认为与感觉-注意力、运动-意图和表征障碍有关。尽管忽视患者可能存在视觉探索缺陷，但这种探索缺陷的本质尚未完全阐明。本研究的目的是了解与对照组相比，忽视患者如何进行视觉探索。
直线二等分试验常用于检测和评估单侧或半空间忽视患者的表现。我们使用红外眼动监测仪对一名患有左前运动意图性忽视的实验对象进行了测试。13名右利手健康志愿者作为对照对象。从不同的起始眼位，我们评估了受试者最初定向到直线、扫描直线，然后试图看向直线中心时的眼球运动方向。
与起始眼位无关，正常受试者最常最初定向到直线的左端，向右扫描，然后向左看向中心。然而，我们患有忽视的实验对象的眼球运动直接指向直线的右端，没有任何扫描或向左回到直线中心的眼球运动。
我们患有忽视的受试者存在直线探索缺陷，这可能归因于定向性眼球运动意图缺陷。
