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首页> 外文期刊>Neuropsychologia >Do visual illusions probe the visual brain? Illusions in action without a dorsal visual stream.
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Do visual illusions probe the visual brain? Illusions in action without a dorsal visual stream.

机译：视觉幻觉会探测视觉大脑吗？幻觉无背视流。

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Visual illusions have been shown to affect perceptual judgements more so than motor behaviour, which was interpreted as evidence for a functional division of labour within the visual system. The dominant perception-action theory argues that perception involves a holistic processing of visual objects or scenes, performed within the ventral, inferior temporal cortex. Conversely, visuomotor action involves the processing of the 3D relationship between the goal of the action and the body, performed predominantly within the dorsal, posterior parietal cortex. We explored the effect of well-known visual illusions (a size-contrast illusion and the induced Roelofs effect) in a patient (IG) suffering bilateral lesions of the dorsal visual stream. According to the perception-action theory, IG's perceptual judgements and control of actions should rely on the intact ventral stream and hence should both be sensitive to visual illusions. The finding that IG performed similarly to controls in three different illusory contexts argues against such expectations and shows, furthermore, that the dorsal stream does not control all aspects of visuomotor behaviour. Assuming that the patient's dorsal stream visuomotor system is fully lesioned, these results suggest that her visually guided action can be planned and executed independently of the dorsal pathways, possibly through the inferior parietal lobule.
机译：视觉错觉比运动行为更能影响感知判断，这被解释为视觉系统中功能分工的证据。主导的感知动作理论认为，感知涉及在腹下颞叶皮层内对视觉对象或场景进行整体处理。相反，运动动作涉及处理目标和身体之间的3D关系，该关系主要在背顶叶后皮质中进行。我们探讨了已知视觉错觉（大小对比错觉和诱导的Roelofs效应）对患有背侧视觉流双侧病变的患者（IG）的影响。根据知觉行为理论，IG的知觉判断和行为控制应依赖完整的腹侧气流，因此两者都应对视觉错觉敏感。 IG在三种不同的虚幻环境中的表现与对照相似，这一发现与这样的期望背道而驰，并且进一步表明，背流不能控制视觉运动行为的所有方面。假设患者的背流可见运动系统完全受损，这些结果表明她的视觉引导动作可以独立于背侧路径进行计划和执行，可能通过下顶叶。

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