Read Jenny C A, Robson Joseph H, Smith Christopher L, Lucas Andrew D
Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne, NE2 4HH, UK; e-mail:
Iperception. 2012;3(10):820-30. doi: 10.1068/i0546. Epub 2012 Dec 19.
The scintillating grid illusion is an intriguing stimulus consisting of a grey grid on a black background, with white discs at the grid intersections. Most viewers perceive illusory "scintillating" black discs within the physical white discs, especially at non-fixated locations. Here, we report for the first time that this scintillation percept is stronger when the stimulus is viewed binocularly than when it is presented to only one eye. Further experiments indicate that this is not simply because two monocular percepts combine linearly, but involves a specifically cyclopean contribution (Schrauf & Spillmann, 2000). However, the scintillation percept does not depend on the absolute disparity of the stimulus relative to the screen. In an intriguing twist, although the basic illusion shows more scintillation when viewed binocularly, when the illusion is weakened by shifting the discs away from the grid intersections, scintillation becomes stronger with monocular viewing.
闪烁网格错觉是一种有趣的视觉刺激，它由黑色背景上的灰色网格组成，网格交叉点处有白色圆盘。大多数观察者会在实际的白色圆盘中感知到虚幻的“闪烁”黑色圆盘，尤其是在非注视位置。在此，我们首次报告，当双眼观察该刺激时，这种闪烁感知比单眼观察时更强。进一步的实验表明，这不仅仅是因为两个单眼感知线性叠加，还涉及一种特殊的独眼视觉贡献（施劳夫和斯皮尔曼，2000年）。然而，闪烁感知并不取决于刺激相对于屏幕的绝对视差。有趣的是，尽管基本错觉在双眼观察时闪烁更多，但当通过将圆盘从网格交叉点移开来减弱错觉时，单眼观察时闪烁会变得更强。
