TRUNK ORIENTATION AS THE DETERMINING FACTOR OF THE CONTRALATERAL DEFICIT IN THE NEGLECT SYNDROME AND AS THE PHYSICAL ANCHOR OF THE INTERNAL REPRESENTATION OF BODY ORIENTATION IN SPACE
TRUNK ORIENTATION AS THE DETERMINING FACTOR OF THE CONTRALATERAL DEFICIT IN THE NEGLECT SYNDROME AND AS THE PHYSICAL ANCHOR OF THE INTERNAL REPRESENTATION OF BODY ORIENTATION IN SPACE
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DOI：
10.1093/brain/114.4.1997
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发表时间：
1991-08-01
期刊：
影响因子：
14.5
通讯作者：
FISCHER, B
中科院分区：
文献类型：
--
作者：
KARNATH, HO;SCHENKEL, P;FISCHER, B
本研究检验了哪个自我中心坐标系决定了偏侧截肢患者受扰的‘对侧’和正常‘同侧’之间的边界。在观察到右脑损伤患者左侧视野(LVF)对刺激的眼跳反应时显著延长的基础上，随机将刺激施加到LVF或RVF，并比较相应的眼跳反应时间(SRT)。从一般用于忽视患者检查的标准体位入手，在保持刺激视网膜投影不变的情况下，系统地改变头、躯干和视野中线平行并垂直于投影屏中央的位置与目标刺激位置之间的空间关系。4例右脑损伤性左侧半横断患者SRTS向LVF的缺失可通过将患者的躯干向左倾斜，使LVF和RVF刺激同时投射到躯干间隙的右侧，来弥补。结果表明，躯干中线的空间方向将我们对空间的正常感知分为以自我为中心的“左”部分和以自我为中心的“右”部分，这似乎是决定脑损伤患者空间中被忽视的“对侧”部分的决定性因素。它们表明，躯干中线构成了计算内部自我中心坐标系的物理锚，用于表示身体相对于外部物体的位置。Ventre等人的假说。(1984)讨论了忽视患者对对侧定位刺激的反应不足可能是这些以自我为中心的坐标向不被忽视的同侧移动的结果。
The present study examines which egocentric coordinate system determines the border between the disturbed 'contralateral' and the normal 'ipsilateral' side in patients with hemineglect. Based on the observation of significantly longer reaction times for saccades towards stimuli presented in the left visual field (LVF) in right brain-damaged patients with hemineglect, stimuli were presented randomly to the LVF or RVF and the corresponding saccadic reaction times (SRTs) were compared. Beginning with the standard body position generally used for the investigation of neglect patients, where the midlines of head, trunk and visual field are parallel and oriented straight towards the middle of the projection screen, the spatial relation between orientation of head and trunk midlines and location of the target stimuli was systematically varied while holding the retinal projection of the stimuli constant. The deficit in SRTs towards the LVF in 4 right brain-damaged patients with left-sided hemineglect could be compensated for by turning the patients' trunk to the left, such that both LVF and RVF-stimuli were projected to the right, ipsilateral side of trunk space. The results suggest that the spatial orientation of the trunk midline divides our normal perception of space into an egocentric 'left' and an egocentric 'right' sector and seems to be the decisive factor for determining the neglected 'contralateral' part of space in patients with brain-damage. They indicate that the trunk midline constitutes the physical anchor for calculation of the internal egocentric coordinate frame for representing body position with respect to external objects. The hypothesis of Ventre et al. (1984) that deficient reactions to contralaterally located stimuli in neglect patients could be the result of a displacement of these egocentric coordinates towards the non-neglected, ipsilateral side is discussed.