S-Cone Filling-in Studied with a Forced-Choice Method
S-Cone Filling-in Studied with a Forced-Choice Method
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用强制选择法研究 S 锥体填充
DOI：
10.1167/18.10.585
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发表时间：
2018
影响因子：
1.8
通讯作者：
Eskew, Jr.
中科院分区：
文献类型：
--
作者：
He, Jingyi;Taveras Cruz, Yesenia;Eskew, Jr.
短波敏感(S)视锥对视网膜图像的采样稀疏，S视锥调节的视觉空间分辨率较差。当两个仅在S锥体激发上不同的小矩形并置时，它们之间的颜色辨别比当可见的间隙或轮廓分隔两个矩形时更差(Boynton等人，1977年)；在没有轮廓的情况下，感知内插或填充过程可能会减小两侧之间的明显差异。本研究首先观察到，当黑色轮廓矩形的上半部分填充S圆锥增量(S+，紫色)，另一半为等亮度灰色时，紫色似乎附着在顶部轮廓框的内部，就好像S圆锥信号传播到矩形内，但通过可见边界阻止其传播到矩形外。我们使用2TIFC方法在几个实验中探索这种影响，通过测量观察者区分两个刺激的能力，这两个刺激都包含在一个黑色轮廓矩形内。在一种情况下，轮廓矩形的一半填充S+贴片，固定在检测阈值，另一半为等亮度灰色，两半之间没有可见的轮廓。另一种可变对比度刺激相同，但S+贴片只填满了轮廓矩形的四分之一(靠近外边缘)，留下75%的矩形填满了灰色。对于小斑块和大斑块的识别阈值比检测阈值高出3倍。这些结果和其他结果表明，这些色块在轮廓矩形的边界附近最明显，这与色度信号在可见轮廓处被抑制的扩散一致。
Sampling of the retinal image by the short-wavelength sensitive (S) cones is sparse, and vision mediated by S cones is of poor spatial resolution. When two small rectangles that differ only in S cone excitation are juxtaposed, chromatic discrimination between them is worse than when a visible gap or contour separates the two rectangles (Boynton et al., 1977); in the absence of the contour, a perceptual interpolation or filling-in process may reduce the apparent difference between the two sides. The present study began with the observation that when the top half of a black outline rectangle was filled with an S cone increment (S+, purplish), with the other half being an equiluminant gray, near threshold the purplish color seemed to adhere to the interior of the outline box at the top, as if the S cone signal spreads into the rectangle but is prevented from spreading outside the rectangle by the visible boundary. We used a 2TIFC method to explore this effect in several experiments, by measuring observers' ability to discriminate two stimuli, both of which were contained within a black outline rectangle. In one condition, half of the outline rectangle was filled with an S+ patch, fixed at detection threshold, and the other half was equiluminant gray, with no visible contour between the two halves. The other, variable contrast stimulus was identical but the S+ patch filled only a quarter of the outline rectangle (adjacent to the outer edge), leaving 75% of the rectangle filled with gray. Discrimination threshold for the small and large patches is up to 3-fold higher than the detection threshold. These and other results suggest these chromatic patches are most visible near the outline rectangle's border, consistent with a spreading of the chromatic signal that is inhibited at visible contours.