Connecting the dots: how local structure affects global integration in infants.
Connecting the dots: how local structure affects global integration in infants.
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DOI：
10.1162/jocn.2009.21323
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发表时间：
2010-07
影响因子：
3.2
通讯作者：
Norcia A
中科院分区：
文献类型：
--
作者：
Palomares M;Pettet M;Vildavski V;Hou C;Norcia A
玻璃图案是由稀疏的随机点场与其空间移动的副本配对创建的莫尔条纹。由于这些模式的区分不是基于本地特征，因此它们已被广泛用于研究全球一体化过程。在这里，我们通过测量视觉诱发电位（VEP）来调查 4-5.5 个月大的婴儿是否对玻璃图案的整体结构敏感。尽管我们发现婴儿对组成点的外观有强烈的反应，但我们发现婴儿对玻璃图案的整体结构的敏感性仅在非常有限的空间分离范围内。相比之下，当我们用线条连接玻璃图案的点对时，我们观察到婴儿的强烈反应。此外，婴儿和成人对描绘不同整体结构的线条图案之间的交换表现出不同的反应。一项改变成人亮度对比度的对照研究表明，婴儿对整体结构的敏感性主要不受元素可见度降低的限制。我们的结果表明，传统玻璃图案对结构不敏感是由于提取点对生成的局部方向线索效率低下。一旦局部方向明确或当插值跨度较小时，婴儿就可以将这些信号整合到图像上。
Glass patterns are moirés created from a sparse random dot field paired with its spatially-shifted copy. Because discrimination of these patterns is not based on local features, they have been used extensively to study global integration processes. Here, we investigated whether 4–5.5 month old infants are sensitive to the global structure of Glass patterns by measuring Visual Evoked Potentials (VEPs). Although we found strong responses to the appearance of the constituent dots, we found sensitivity to the global structure of the Glass patterns in the infants only over a very limited range of spatial separation. In contrast, we observed robust responses in the infants when we connected the dot pairs of the Glass pattern with lines. Moreover, both infants and adults showed differential responses to exchanges between line patterns portraying different global structures. A control study varying luminance contrast in adults suggests that infant sensitivity to global structure is not primarily limited by reduced element visibility. Together our results suggest that the insensitivity to structure in conventional Glass patterns is due to inefficiencies in extracting the local orientation cues generated by the dot pairs. Once the local orientations are made unambiguous or when the interpolation span is small, infants can integrate these signals over the image.
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