Junctions and cost functions in motion interpretation.
Junctions and cost functions in motion interpretation.
复制标题
运动解释中的连接点和成本函数。
DOI：
10.1167/4.7.3
复制
发表时间：
2004
影响因子：
1.8
通讯作者：
Adelson,EdwardH
中科院分区：
文献类型：
--
作者：
McDermott,Josh;Adelson,EdwardH
形状、运动、遮挡和知觉组织密切相关。我们试图评估连接在它们相互作用中的作用。我们使用的刺激是基于在一个封闭的孔径内移动的十字。十字架上的两根横条看起来是结合在一起的，还是根据上下文分开移动的；与先前的文献一致，运动解释部分取决于条状端点是否被遮挡。为了测试连接在运动解释中的重要性，我们探索了改变刺激中闭塞点产生的连接的效果，从t -连接到l -连接。在某些情况下，这种变化对感知运动有很大的影响；在其他情况下，它几乎没有什么区别，这表明连接并不是关键变量。进一步的实验表明，重要的不是连接点本身，而是当连接点类别改变时，是否引入了错觉轮廓。我们的结果与基于优化的计算一致，该计算旨在最大限度地减少感知表征中虚幻轮廓的存在。虽然可能用结点之间的相互作用来解释我们的结果，但简约倾向于用在分层表面解释上运行的成本函数来解释，而没有明确提及结点。
Form, motion, occlusion, and perceptual organization are intimately related. We sought to assess the role of junctions in their interaction. We used stimuli based on a cross moving within an occluding aperture. The two bars of the cross appear to cohere or move separately depending on the context; in accord with prior literature, motion interpretation depends in part on whether the bar endpoints appear to be occluded. To test the importance of junctions in motion interpretation, we explored the effect of changing the junctions generated at the occlusion points in our stimuli, from T-junctions to L-junctions. In some cases, this change had a large effect on perceived motion; in others, it made little difference, suggesting junctions are not the critical variable. Further experiments suggested that what matters is not junctions per se, but whether illusory contours are introduced when the junction category is changed. Our results are consistent with an optimization-based computation that seeks to minimize the presence of illusory contours in the perceptual representation. Although it may be possible to explain our results with interactions between junctions, parsimony favors an explanation in terms of a cost-function operating on layered surface interpretations, with no explicit reference to junctions.