Levels of processing in visual illusions: The combination and interaction of distortion-producing mechanisms

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To assess the mode and sequence of interaction of visual-geometric illusion mechanisms, responses to simple and composite overestimation configurations were measured in 72 observers. Analyses suggested that some illusion mechanisms added their distortions to the outputs of others and that other mechanisms averaged. A logarithmic or near-logarithmic transformation seemed to occur when illusory effects combined. A path analysis of the results suggests that some illusory mechanisms combined in a serial manner and that others operated on separate parallel channels. Notions based on simple addition of illusory effects and on serial linear processing were not supported by these analyses. (46 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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