Stable visual perception, while we are moving, depends on complex interactions between multiple brain regions. We report a patient with damage to the right occipital and temporal lobes who presented with a visual disturbance of inward movement of roadside buildings towards the centre of his visual field, that occurred only when he moved forward on his motorbike. We describe this phenomenon as “self-motion induced environmental kinetopsia”. Additionally, he was identified to have another illusion, in which objects displayed on the screen, appeared to pop out of the background. Here, we describe the clinical phenomena and the behavioural tasks specifically designed to document and measure this altered visual experience. Using the methods of lesion mapping and lesion network mapping we were able to demonstrate disrupted functional connectivity in the areas that process flow-parsing such as V3A and V6 that may underpin self-motion induced environmental kinetopsia. Moreover, we suggest that altered connectivity to the regions that process environmental frames of reference such as retrosplenial cortex (RSC) might explain the pop-out illusion. Our case adds novel and convergent lesion-based evidence to the role of these brain regions in visual processing.

中文翻译：

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自我运动引起的环境运动幻觉和弹出幻觉——来自单例现象学的见解

当我们移动时，稳定的视觉感知取决于多个大脑区域之间的复杂相互作用。我们报告了一位右枕叶和颞叶受损的患者，他出现了路边建筑物向视野中心向内移动的视觉障碍，这种情况只有在他骑摩托车向前移动时才会发生。我们将这种现象描述为“自我运动引起的环境动感”。此外，他还被发现有另一种错觉，即屏幕上显示的物体似乎从背景中弹出。在这里，我们描述了专门设计用于记录和测量这种改变的视觉体验的临床现象和行为任务。使用病变映射和病变网络映射的方法，我们能够证明处理流解析的区域（例如 V3A 和 V6）中功能连接被破坏，这些区域可能支撑自运动诱导的环境运动。此外，我们认为，与处理环境参考框架（例如压后皮层（RSC））的区域的连接性改变可能可以解释弹出错觉。我们的案例为这些大脑区域在视觉处理中的作用添加了新颖且基于病变的聚合证据。