illumination levels and are responsible for sensations of color.
The various components of the visual system interact constantly, and these interactions
actively shape and transform the stimulus input. One kind of interaction involves contrast effects,
including brightness contrast. These effects serve to accentuate edges—as in the case of Mach
bands. The physiological mechanism underlying this effect is lateral inhibition, a clear example of
how the visual system refines the stimulus information by emphasizing some aspects of the input
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