The influence of different luminance contrasts and equiluminance on illusory motion in four inducing patterns was studied: Enigma, Rotating Snakes, Pinna, and Rotating-Tilted-Lines. At high luminance contrast the Pinna and the Rotating-Tilted-Lines illusions are significantly stronger than at low luminance contrast, whereas the Enigma and Rotating Snakes illusions are stronger at low luminance contrast. At equiluminance along the L–M axis the strength of all illusions is greatly reduced. Data suggest that luminance contrast constitutes one important factor for their occurrence.
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