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Representation of motion boundaries in retinotopic human visual cortical areas

机译:视网膜视网膜人类视觉皮层区域的运动边界表示

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Edges are important in the interpretation of the retinal image. Although luminance edges have been studied extensively, much less is known about how or where the primate visual system detects boundaries defined by differences in surface properties such as texture, motion or binocular disparity. Here we use functional magnetic resonance imaging (fMRI) to localize human visual cortical activity related to the processing of one such higher-order edge type: motion boundaries. We describe a robust fMRI signal that is selective for motion segmentation. This boundary-specific signal is present, and retinotopically organized, within early visual areas, beginning in the primary visual cortex (area V1). Surprisingly, it is largely absent from the motion-selective area MT/V5 and far extrastriate visual areas. Changes in the surface velocity defining the motion boundaries affect the strength of the fMRI signal. In parallel psychophysical experiments, the perceptual salience of the boundaries shows a similar dependence on surface velocity. These results demonstrate that information for segmenting scenes by relative motion is represented as early as V1.
机译:边缘在视网膜图像的解释中很重要。尽管对亮度边缘进行了广泛的研究,但是关于灵长类动物视觉系统如何或在何处检测由表面特性(例如纹理,运动或双目视差)差异定义的边界的了解甚少。在这里,我们使用功能磁共振成像(fMRI)来定位与一种这样的高阶边缘类型:运动边界的处理相关的人类视觉皮层活动。我们描述了一个强大的功能磁共振成像信号,对运动分割具有选择性。从早期的视觉皮层(区域V1)开始,在早期的视觉区域中存在这种特定于边界的信号,并在视网膜上进行组织。出人意料的是,运动选择区域MT / V5和远超视觉区域几乎没有。限定运动边界的表面速度的变化会影响fMRI信号的强度。在平行的心理物理实验中,边界的感知显着性显示出对表面速度的相似依赖性。这些结果表明,最早通过V1表示用于通过相对运动分割场景的信息。

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