Locus of spatial attention determines inward-outward anisotropy in crowding.
Locus of spatial attention determines inward-outward anisotropy in crowding.
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DOI：
10.1167/11.4.1
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发表时间：
2011-04
影响因子：
1.8
通讯作者：
Y. Petrov;Olga Meleshkevich
中科院分区：
文献类型：
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作者：
Y. Petrov;Olga Meleshkevich
人们早就知道，在拥挤的情况下，外向口罩比内向口罩更具破坏性（H. Bouma，1973）。我们表明，注意力的焦点强烈影响这种向内-向外的各向异性，在某些情况下消除它，在另一些情况下逆转它。在 2AFC 范式中，受试者确定给定方向的高对比度 Gabor 目标是否出现在注视点的左侧或右侧。当使用固定偏心率（8°）时，向外的格子面罩比向内的面罩产生更强的拥挤。当 7°、8° 和 9° 偏心率在同一运行中交错时，分散注意力，向内和向外掩模对所有三个偏心率产生相同程度的拥挤。当目标识别取决于中心凹线索时，注意力会向内倾斜，向内的掩模会产生更强烈的拥挤。最后，使用一种新的对比度检测范式来证明注意力通常错误地定位在目标之外，这可以解释在拥挤中常见的各向异性。我们的结果表明空间注意力与拥挤机制密切相关。
It has long been known that an outward mask is much more disruptive than an inward mask in crowding (H. Bouma, 1973). We show that the locus of attention strongly affects this inward-outward anisotropy, removing it in some conditions and reversing it in others. In a 2AFC paradigm, subjects identified whether a high-contrast Gabor target of a given orientation was presented left or right of fixation. When a fixed eccentricity (8°) was used, the outward plaid mask produced much stronger crowding than the inward mask. When 7°, 8°, and 9° eccentricities were interleaved within the same run, diffusing attention, the inward and outward masks produced the same amount of crowding for all three eccentricities. When target identification was contingent on a foveal cue, biasing attention inward, the inward mask produced stronger crowding. Finally, a new contrast-detection paradigm was used to demonstrate that attention is generally mislocalized outward of the target, which may explain the commonly observed anisotropy in crowding. Our results suggest that spatial attention is intimately involved in the mechanism of crowding.