High-level theories：the perceptual process as a thought-like process.Scenes that contain multiple depth planes or projected illumination boundaries（such as the edge of a shadow）.Failure：to predict what humans actually perceive when viewing typical scenes from our everyday world.These theories, of which there are many, are very concrete and consistent with the received wisdom of sensory physiology.Low-level theories stemming largely from Ewald Hering：known, relatively simple, peripheral neural mechanisms, such as lateral inhibition and spatial filtering.Reflection of the surface： White－－about 90% of the light Black－－about 3% of the light.Lightness：the perceptual dimension that runs from black, through gray, to white.Gilchrist, Current Biology, 2007 Apr 17；Volume 17, Issue 8, Pages R267-R269
Simultaneous lightness contrast is not specifically a lightness illusion, yet it is a particular case of a more general phenomenon known as the ‘anchoring effect’.Simultaneous lightness contrast is a classical visual illusion, which has been the focus of research for several generations of visual scientists.Logvinenko School of Psychology, Queen’s University of Belfast Neuroscience Letters 334(2002) The anchoring effect in lightness perception in humans Alexander D.
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