Chromatic shadow compatibility and cone-excitation ratios |
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Authors: | Heckman Genevieve M Muday Jeffrey A Schirillo James A |
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Affiliation: | Department of Psychology, Wake Forest University, Winston-Salem, North Carolina 27109, USA. |
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Abstract: | Logvinenko Perception 31, 201 (2002)] asserts that Adelson's wall-of-blocks illusion Science 262, 2042 (1993)], where identical gray-cube surface tops appear to differ in brightness, arises when the surfaces surrounding the cube tops are shadow compatible, creating a concomitant illusion of transparency. We replicated Logvinenko's main findings in the chromatic domain across three experiments in which observers match cube tops in hue, saturation, and brightness. A second set of stimuli adjusted cone-excitation ratios across the apparent transparency border Proc. R. Soc. London 257, 115 (1994)], which enhanced lightness and brightness constancy but only when the stimuli varied in both chromaticity and intensity. |
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