Brightness assimilation in bullseye displays
Brightness assimilation in bullseye displays
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DOI：
10.1016/s0042-6989(03)00430-9
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发表时间：
2004-02-01
期刊：
影响因子：
1.8
通讯作者：
Chubb, C
中科院分区：
文献类型：
--
作者：
Bindman, D;Chubb, C
在同时亮度对比显示器中，以黑色为边界的灰色目标方块G（B）看起来比以白色为边界的相同灰色目标方块G（W）更亮。在这里，我们证明，如果G（B）被从黑色到白色向外交替的条带包围，而G（W）被从白色到黑色向外交替的条带包围，则这种效应可以逆转。通过这些简单的“靶心”显示，同化通常发生-G（B）比G（W）看起来更暗。实验1和2使用2AFC设计，显示持续时间为2.2 s。这些实验的结果表明，（i）大量的同化发生的目标韦伯对比（相对于灰色背景）为-0.25，0和0.25，但同化作用在目标对比度为-0.25时最大，并随着目标对比度的增加而降低;（ii）无论四个环绕带的宽度为20%，同化作用都是相同的，目标的40%或目标的40%，以及（iii）同化发生在少至2个环绕带的情况下，并且效果的大小随着带的数量增加而略有增加：当实验I使用匹配的方法重新运行时，（实验3），然而，结果发生了戏剧性的变化：（中度）同化效应仅在目标对比度为-0.25时出现，目标对比度为0.25时出现亮度对比效应，目标对比度为0时不出现错觉。DeValois和DeValois [Spatial Vision，Oxford University Press，纽约，1988]中描述的CSF模型、Gilchrist等人[Psychological Review，106（4）（1999）795]的锚定模型或Blakeslee和McCourt [Vision Research 39（1999）4361]的ODOG模型都不能预测靶心显示中的同化效应。我们认为，这种同化效应是对比抑制机制的结果，类似于Chubb等人[Proceedings for the National Academy of Science，vol.86，1989，p.9631]提出的作为对比效应基础的机制。(C)2003 Elsevier Ltd.保留所有权利。
In simultaneous brightness contrast displays, a gray target square G(B) bordered by black appears brighter than an identical gray target square G(W) bordered by white. Here we demonstrate that this effect can be reversed if G(B) is Surrounded by bands that alternate outward from black to white, while G(W) is surrounded by bands that alternate outward from white to black. With these simple "bullseye" displays assimilation generally occurs-G(B) appears darker than G(W). Experiments 1 and 2 used a 2AFC design with a 2.2 s display duration. The results of these experiments indicate that (i) substantial assimilation occurs for target Weber contrasts (relative to the gray background) of -0.25, 0, and 0.25, but assimilation was maximal when target contrast was -0.25 and decreased as target contrast increased, (ii) assimilation effects were the same whether the width of the four surround bands was 20%, of the target or 40% of the target, and (iii) assimilation occurs with as few as 2 surround-bands and the magnitude of the effect increases slightly as the number of bands increase: When experiment I was re-run using the method of matching (experiment 3), however, the results changed dramatically: (moderate) assimilation effects were found only when target contrast was -0.25; when target contrast was 0.25, there was a brightness contrast effect, when target contrast was 0, there was no illusion. Assimilation effects in bullseye displays are not predicted by the CSF model described in DeValois and DeValois [Spatial Vision, Oxford University Press, New York, 1988], the anchoring model of Gilchrist et al. [Psychological Review, 106(4) (1999) 795], or Blakeslee and McCourt's [Vision Research 39 (1999) 4361] ODOG model. We propose that this assimilation effect is the result of a contrast inhibition mechanism similar to that proposed by Chubb et al. [Proceedings for the National Academy of Science, vol. 86, 1989, p. 9631] to underlie contrast effects. (C) 2003 Elsevier Ltd. All rights reserved.