Is the hemispatial deficit produced by right parietal lobe damage associated with retinal or gravitational coordinates?
Is the hemispatial deficit produced by right parietal lobe damage associated with retinal or gravitational coordinates?
复制标题
右顶叶损伤造成的半侧空间缺陷是否与视网膜或重力坐标相关？
DOI：
10.1093/brain/110.1.167
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Ladavas,E
中科院分区：
文献类型：
--
作者：
Ladavas,E
假设右后顶叶损伤导致两种注意力缺陷，即对左视野（LVF）中刺激的反应性降低，以及对占据相对左侧位置的任何刺激的反应性降低，在实验1和实验2中，通过测量反应时（RTs）来检验第一个假设，视觉刺激LVF和RVF中提出的，而第二个假设进行了测试，通过测量RT的刺激完全定位在LVF中，并在RVF。结果表明：（1）相对左侧刺激的反应时长于相对右侧刺激的反应时，独立于受刺激的视野，以及（2）实验3旨在研究右顶叶损伤引起的注意缺陷是否主要与重力的使用有关，而不是与视网膜坐标在这个实验中，患者将头部向左或向右倾斜90度，他们对固定标记上方和两侧显示的两个刺激做出反应。结果表明，注意左侧的困难与重力和视网膜参考系有关。
The hypothesis that right posterior parietal lesions cause two attentional deficits, namely, a reduced reactivity to stimuli in the left visual field (LVF), and a reduced reactivity to any stimulus which occupies a relative left position, was tested in 8 patients with an extinction syndrome.In Experiments 1 and 2 the first hypothesis was tested by measuring reaction times (RTs) to visual stimuli presented in the LVF and in the RVF, whereas the second hypothesis was tested by measuring RTs to stimuli totally positioned in the LVF, and in the RVF. The results showed that (1) RTs to stimuli which occupied a relative left position were longer than RTs to stimuli which occupied a relative right position, independent of the visual field stimulated and (2) RTs to LVF stimuli were longer than RTs to RVF stimuli.Experiment 3 was designed to examine whether the attentional deficit associated with right parietal damage was mostly related to the use of gravitational rather than to retinal coordinates. In this experiment the patients tilted the head either to the left or the right by 90 deg and they responded to two stimuli displayed above and on either side of a fixation mark. The results showed that the difficulty in attending to the left was related both to the gravitational and the retinal frames of reference.