The role of part structure in the perceptual localization of a shape
The role of part structure in the perceptual localization of a shape
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DOI：
10.1068/p5518
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发表时间：
2006-01-01
期刊：
影响因子：
1.7
通讯作者：
Kowler, Eileen
中科院分区：
文献类型：
--
作者：
Denisova, Kristina;Singh, Manish;Kowler, Eileen
对象定位的过程可以相对于特定的参考位置（例如重心COG）来完成（例如Vishwanath和Kowler，2003 Vision Research 43 1637-1653）。在这里，我们研究了零件结构如何影响对象的参考位置。用嵌入较大物体内的内部目标元素的错觉位移的测量来评估参考位置（Morgan等，1990 Vision Research 30 1793-1810）。为了检查具有部件结构的形状的参考位置是否不同，测试了两种形状：圆形（小和大;没有部件结构）和钟形（具有两个部件的形状，一个比另一个大）。研究人员对两种预测结果进行了检验：一种是物体的位置是基于其整体形状，而不考虑部分结构（即单一的整体COG），另一种是各部分被单独处理（不同的COG）。有了铃铛，幻觉明显弱于两个圆圈--尽管铃铛的主体部分和小圆圈一样大，它的水平轴和大圆圈一样长。此外，对钟的距离判断与位于较大部分的重心处的（较弱）参考点一致，而不是位于整个钟的重心处。这些结果表明，形状的部分结构在其位置的表示中起着作用，并且对于复杂形状，嵌入元素的感知位置更多地取决于嵌入元素的部分，而不是整个形状。
The process of object localization may be accomplished with respect to a particular reference location, such as the center of gravity, COG (eg Vishwanath and Kowler, 2003 Vision Research 43 1637-1653). Here, we investigated how part structure affects an object's reference location. The reference location was evaluated with a measure of the illusory displacement of an internal target element embedded within a larger object (Morgan et at, 1990 Vision Research 30 1793-1810). To examine whether the reference location is different for shapes with part structure, two shapes were tested: circle (small and large; no part structure) and bell (shape with two parts, one larger than the other). Results were examined with respect to two predictions: either the location of an object is based on its shape as a whole, disregarding part structure (ie a single, overall COG), or the parts are processed separately (different COGs).With the circles, the results showed a systematic illusory displacement of the internal target toward the COG. With the bell, the illusion was significantly weaker than with both circles-even though the main part of the bell had the same size as the small circle, and its horizontal axis had the same extent as the large circle. Moreover, the distance judgments for the bell were consistent with a (weaker) reference point being located at the COG of the larger part, rather than at the COG of the entire bell. These results show that the part structure of a shape plays a role in the representation of its location, and that for complex shapes the perceived location of an embedded element depends more on the parts within which it is embedded, rather than on the whole shape.