Colour perception induced by Bidwell disk under chromatic illumination A Svegzda, R Stanikunas, A Daugirdiene, H Vaitkevicius, R Bliumas, V Kulbokaite, A Novickovas |
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Department of General Psychology, Vilnius University, Lithuania
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| The Bidwell effect is a convincing colour illusion phenomenon. In the original setup the half white, half black disk is illuminated with a white light and rotated few times per second. A hole is made between these two sectors and the red light is placed behind the disk. The greenish-blue colour is perceived despite the physical red light shining through the hole. We investigated colour perception of Bidwell effect under various chromatic illuminations. The back side of the disk was lit by red, green and blue LED lights, while the front side of the disk was illuminated by the same LEDs plus amber and neutral D65 light mixed from those four LEDs. We explored all possible fifteen colour combinations for the front and back side of the disk. It was found that perceived subjective colors of Bidwell stimuli is affected by colored illumination. Moreover, the same LED illumination from the front and the back sides of the disk produces temporal lightness modulation which induces different color perception comparing with constant lightness illumination. [Supported by the Research Council of Lithuania MIP-23/2010 and MIP-013/2012] |
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