Hemispatial neglect, usually after right hemisphere lesions, is characterized by contralesional deficits in attention and perception. However, little is known about impairments of perceptual processing in the ipsilesional region of visual space (the right visual field for right hemisphere lesions). In two right hemisphere neglect patients, we used a metacontrast masking paradigm to characterize systematic spatial and temporal visual processing deficits in the ipsilesional right visual field. The presence of a visual mask caused the neglect patients to miss targets in ipsilesional space, even when a mask was presented as long as 1.5 sec after the target and in a different spatial position. These prolonged and spatially extended masking effects were not measured in age-matched healthy controls or in two control patients with hemianopsia but without neglect. The results show that perceptual processing is distorted and delayed in a region of the visual field that has been thought to be unaffected - the ipsilesional hemifield in patients with neglect.

中文翻译：

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偏侧偏瘫患者的知觉知觉缺陷：病例报告。

偏瘫通常在右半球病变后出现，其特点是注意力和知觉对立障碍。然而，关于视空间同侧区域（右半球病变的右视野）知觉加工的损害知之甚少。在两名右半球被忽视的患者中，我们使用元对比掩盖范例来描述同侧右视野中系统性的时空视觉处理缺陷。视觉遮罩的存在导致疏忽的患者错过了同病异体空间中的目标，即使在目标之后1.5秒钟内在不同的空间位置放置遮罩也是如此。在年龄匹配的健康对照者或两名患有偏盲但没有忽视的对照患者中，未测量到这些延长的和在空间上扩展的掩盖作用。结果表明，在被认为不受影响的视野区域（被忽视患者的同侧半视野）中，知觉处理受到扭曲和延迟。