Visuomotor performance based on peripheral vision is impaired in the visual form agnostic patient DF
Visuomotor performance based on peripheral vision is impaired in the visual form agnostic patient DF
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DOI：
10.1016/j.neuropsychologia.2011.11.002
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发表时间：
2012-01-01
期刊：
影响因子：
2.6
通讯作者：
Schenk, Thomas
中科院分区：
文献类型：
--
作者：
Hesse, Constanze;Ball, Keira;Schenk, Thomas
感知-行动模型指出，根据获取信息的目的，视觉信息在不同的皮层区域被处理。具体来说，有人认为腹侧流介导视觉感知，而背侧流主要处理视觉信息以指导行动（Goodale & Milner, 1992）。该模型的证据来自患者研究，表明腹侧流损伤患者（视觉形式失认症）和背侧流损伤患者（视神经共济失调）在动作和感知任务中表现出不同的表现。DF，一名患有视觉形式失认症的患者，尽管无法使用视觉完成知觉任务，但在视觉运动任务中表现良好，而视觉共济失调患者通常表现相反的模式，即良好的知觉但视觉运动控制受损。这两种疾病似乎都引发了一种镜像逆转的视觉功能完好和受损模式，导致人们相信视觉共济失调和视觉形式失认症可以被认为是互补疾病。然而，视神经共济失调患者的视觉运动功能通常仅在视觉外周测试时受损，而在中央视觉测试时通常保留。在这里，我们表明DF的视觉运动性能也只有在目标集中呈现时才能保持。她对周边视觉目标的伸手和抓握动作异常。我们的研究结果表明，DFs的视觉运动表现与视神经共济失调患者的视觉运动表现非常相似，这推翻了之前认为这两种疾病形成双重分离的观点。(C) 2011 Elsevier Ltd.版权所有。
The perception-action model states that visual information is processed in different cortical areas depending on the purpose for which the information is acquired. Specifically, it was suggested that the ventral stream mediates visual perception, whereas the dorsal stream primarily processes visual information for the guidance of actions (Goodale & Milner, 1992). Evidence for the model comes from patient studies showing that patients with ventral stream damage (visual form agnosia) and patients with dorsal stream damage (optic ataxia) show divergent performance in action and perception tasks. Whereas DF, a patient suffering from visual form agnosia, was found to perform well in visuomotor tasks despite her inability to use vision for perceptual tasks, patients with optic ataxia show usually the opposite pattern, i.e. good perception but impaired visuomotor control. The finding that both disorders seem to provoke a mirror-reversed pattern of spared and impaired visual functions, led to the belief that optic ataxia and visual form agnosia can be considered as complementary disorders. However, the visuomotor performance of patients with optic ataxia is typically only impaired when they are tested in visual periphery while being often preserved when tested in central vision. Here, we show that DF's visuomotor performance is also only preserved when the target is presented centrally. Her reaching and grasping movements to targets in peripheral vision are abnormal. Our findings indicate that DFs visuomotor performance is quite similar to the visuomotor performance of patients with optic ataxia which undermines previous suggestions that the two disorders form a double-dissociation. (C) 2011 Elsevier Ltd. All rights reserved.