A gray target can appear lighter or darker depending on its surrounding spatial context. We examined the effect of exposure time on three such examples (simultaneous lightness contrast, dungeon illusion, and the two-room arrangement), finding very different results with exposure time as brief as 15 ms: the simultaneous lightness contrast was much stronger, the effect of the dungeon illusion was reversed, and the lightness difference between the two isoluminant patches in the two-room arrangement disappeared. These suggest that local luminance ratios dominate lightness perception in a brief flash.

中文翻译：

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瞬间亮度：曝光时间对亮度感知的影响

灰色目标可能会显得更亮或更暗，具体取决于其周围的空间背景。我们检查了曝光时间对三个此类示例（同时亮度对比、地牢幻觉和两室布置）的影响，发现曝光时间短至 15 毫秒时结果截然不同：同时亮度对比更强，效果也更好。地牢幻象的效果被逆转，两室布置中两个等亮度斑块之间的亮度差异消失了。这些表明局部亮度比在短暂闪光中主导亮度感知。