Objects are often identified by the shapes of their boundaries. Here, by measuring threshold amplitudes for detection of sinusoidal modulation of local position, orientation and centrifugal speed in a closed path of Gabor patches, we show that the positions of such boundaries are misperceived to accommodate local illusions of orientation context and motion induced positional bias. These two types of illusion are shown to occur independently, but the misperception of position is additive. We conclude that, in the analysis of shape, the visual system uses the apparent rather than the veridical boundary conformation.

中文翻译：

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形状分析使用局部表观位置而不是物理位置。

对象通常通过其边界的形状来识别。在这里，通过测量用于检测 Gabor 贴片闭合路径中局部位置、方向和离心速度的正弦调制的阈值幅度，我们表明这些边界的位置被误解以适应方向上下文和运动引起的位置偏差的局部错觉。这两种错觉被证明是独立发生的，但对位置的误解是相加的。我们得出结论，在形状分析中，视觉系统使用明显的而不是真实的边界构象。