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However, rather than varying the brightness of the modulated signal as is done in most perceptual research, we mimic real world situations in which displays have constant brightness and the surrounding ambient light level varies. In our tests the display modulates between an image and its inverse at a constant brightness level, while the subject adjusts the level of ambient illumination until flickering artifacts are just noticeable.ResultsUniform Light vs. Spatial EdgeWe presented users with a modulated light source, and asked them to determine the level of ambient illumination under which flicker was just noticeable.

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