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首页> 外文期刊>Vision Research: An International Journal in Visual Science >Global contour shapes are coded differently from their local components.
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Global contour shapes are coded differently from their local components.

机译：全局轮廓形状的编码与本地组件的编码不同。

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摘要

Previous research has shown that the mechanisms that process curved contours are selective for low-level attributes such as luminance contrast polarity and luminance spatial-frequency, while those that process curvature-defined global shapes are not. While these findings are consistent with the view that higher stages of object processing are relatively agnostic to low-level attributes, methodological differences (appearance-based tasks in the former versus performance-based tasks in the latter) might instead be the reason. In this study, we demonstrate a radial frequency pattern analog of the shape-amplitude after-effect, or SAAE, termed the radial frequency amplitude after-effect, or RFAAE. We use the RFAAE to investigate whether global contour shapes are represented differently from their local components. Results show that the RFAAE, like the SAAE, is bidirectional (perceived amplitude can be shifted by adaptation in either direction), showing that RF-shape mechanisms are selective for amplitude. However, unlike the SAAE, the RFAAE is not selective for luminance contrast polarity or for luminance spatial-frequency. These findings using an appearance-based approach reinforce the conclusions from previous performance-based studies that global contour shapes are coded differently from their local components.
机译：先前的研究表明，过程弯曲轮廓的机制对于低水平属性（例如亮度对比度和亮度空间频率）具有选择性，而处理曲率定义的全局形状的机制则不适合。尽管这些发现与以下观点一致：较高的对象处理阶段对低级属性相对不可知，但方法论上的差异（前者中的基于外观的任务与后者的基于性能的任务）可能是原因。在这项研究中，我们证明了形状振幅后效应或SAAE的径向频率模式类似，称为径向频率振幅后效应或RFAAE。我们使用RFAAE来研究全球轮廓形状是否与其本地组件不同。结果表明，RFAAE像SAAE一样是双向的（可以通过在任一方向上适应来移动感知的振幅），表明RF形状机制对于振幅而言是选择性的。但是，与SAAE不同，RFAAE对亮度对比度或亮度空间频率不是选择性。这些发现使用基于外观的方法加强了以前基于绩效的研究的结论，即全球轮廓形状与其本地组件的编码不同。

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