Manual responses and saccades in chronic and recovered hemispatial neglect: a study using visual search
Manual responses and saccades in chronic and recovered hemispatial neglect: a study using visual search
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DOI：
10.1016/s0028-3932(01)00189-0
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发表时间：
2002-01-01
期刊：
影响因子：
2.6
通讯作者：
Gilchrist, ID
中科院分区：
文献类型：
--
作者：
Harvey, M;Olk, B;Gilchrist, ID
半侧空间忽视影响对空间对侧的目标作出反应的能力和对这些目标进行程序扫视的能力。在目前的研究中，我们详细研究了一系列视觉搜索任务中的眼跳编程和手动反应时间（RT），其中任务难度通过改变干扰物的性质而系统地增加。在条件1中，目标没有干扰物。在其他条件下，显示器包含三个分心物，这些分心物在不同条件下被改变以操纵与目标的相似性，从而控制任务难度。我们测试了两名忽视患者，一名慢性，一名沿着恢复，以及两名RCVA对照患者和12名年龄匹配的对照。当目标单独出现时，两个被忽视的病人都能成功地扫视被忽视的区域。然而，分离出现在两个病人之间的目标时，提出了分心项目。在三种搜索条件下，患者ER第一次扫视目标表现显示了干扰物类型的明显影响。相反，对于AF恢复患者，所有搜索显示均存在左/右差异，并且无论干扰物类型如何，左/右差异似乎都是恒定的。这种不同的行为模式可能反映了这些患者忽视的不同潜在神经原因。在目前的研究中，扫视的测量允许任务被细分，从而揭示了多种机制控制扫视在搜索中的作用。(C)2002爱思唯尔科技有限公司版权所有。
Hemispatial neglect affects both the ability to respond to targets on the contralesional side of space and to programme saccades to such targets. In the current study, we looked in detail at saccade programming and manual reaction times (RTs) in a range of visual search tasks, in which task difficulty was systematically increased by changing the nature of the distracters. In condition 1, the target was presented with no distracters. In the other conditions, displays contained three distracters that were changed across conditions to manipulate similarity to the target and so task difficulty.We tested two neglect patients, one chronic, one recovered along with two RCVA control patients and 12 age-matched controls. Both neglect patients studied could successfully execute saccades into the neglected field when the target was presented alone. However, a dissociation emerged between the two patients when the target was presented with distracter items. Patient ERs first saccade to target performance in the three search conditions revealed clear effects of distracter type. In contrast for the recovered patient AF, the left/right difference was present for all search displays and appeared to be constant regardless of distracter type. This differential pattern of behaviour may reflect the different underlying neural causes of the neglect in these patients. In the current study, the measurement of saccades allowed the task to be fractionated, and thus, reveal the action of multiple mechanisms controlling saccades in search. (C) 2002 Elsevier Science Ltd. All rights reserved.