Objective:Patients with unilateral stroke commonly show hemispatial neglect or milder contralesional visuoattentive deficits, but spatially non-lateralized visuoattentive deficits have also been reported. The aim of the present study was to compare spatially lateralized (i.e., contralesional) and non-lateralized (i.e., general) visuoattentive deficits in left and right hemisphere stroke patients.Method:Participants included 40 patients with chronic unilateral stroke in either the left hemisphere (LH group, n = 20) or the right hemisphere (RH group, n = 20) and 20 healthy controls. To assess the contralesional deficits, we used a traditional paper-and-pencil cancellation task (the Bells Test) and a Lateralized Targets Computer Task. To assess the non-lateralized deficits, we developed a novel large-screen (173 × 277 cm) computer method, the Ball Rain task, with moving visual stimuli and fast-paced requirements for selective attention.Results:There were no contralesional visuoattentive deficits according to the cancellation task. However, in the Lateralized Targets Computer Task, RH patients missed significantly more left-sided than right-sided targets in bilateral trials. This omission distribution differed significantly from those of the controls and LH patients. In the assessment of non-lateralized attention, RH and LH patients missed significantly more Ball Rain targets than controls in both the left and right hemifields.Conclusions:Computer-based assessment sensitively reveals various aspects of visuoattentive deficits in unilateral stroke. Patients with either right or left hemisphere stroke demonstrate non-lateralized visual inattention. In right hemisphere stroke, these symptoms can be accompanied by subtle contralesional visuoattentive deficits that have remained unnoticed in cancellation task.

中文翻译：

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单侧中风：基于计算机的评估发现非侧向和对侧视觉注意力缺陷

目的：单侧卒中患者通常表现出半侧空间忽视或较轻的对侧视觉注意缺陷，但也有报道称空间非侧向性视觉注意缺陷。本研究的目的是比较左半球和右半球卒中患者的空间偏侧（即对侧）和非偏侧（即一般）视觉注意缺陷。方法：参与者包括 40 名左半球慢性单侧卒中患者（LH组，n= 20) 或右半球 (RH 组,n= 20) 和 20 名健康对照。为了评估对侧缺陷，我们使用了传统的纸笔取消任务（贝尔斯测试）和横向目标计算机任务。为了评估非侧向缺陷，我们开发了一种新的大屏幕 (173 × 277 cm) 计算机方法，即球雨任务，具有移动的视觉刺激和快节奏的选择性注意要求。结果：没有对侧视觉注意力缺陷根据取消任务。然而，在横向目标计算机任务中，RH 患者在双边试验中错过的左侧目标明显多于右侧目标。这种遗漏分布与对照组和 LH 患者的分布显着不同。在评估非侧化注意力时，RH 和 LH 患者在左右半场错过的 Ball Rain 目标明显多于对照组。结论：基于计算机的评估敏感地揭示了单侧卒中视觉注意力缺陷的各个方面。患有右脑或左脑卒中的患者表现出非侧向性视觉注意力不集中。在右半球中风中，这些症状可能伴随着轻微的对侧视觉注意力缺陷，这些缺陷在取消任务中仍未被注意到。