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Similarity and Lightness Effects in Ebbinghaus Illusion Created by Keyboard Characters

36 observers judged the size of a central S in variants of the Ebbinghaus figure having contextual Ss, Ss, or Hs. When the figures were composed of similarly shaped elements, underestimation of the central S was obtained. Manipulations of lightness indicated that these underestimations were strongest for figures with gray contextual characters and a black central S and weakest for figures with black contextual characters and a gray central S. All black or all gray figures produced intermediate illusions. The data are consistent with Choplin and Medin's 1999 claim that figural properties rather than semantic similarity influences size contrast and further show that the visual processes underlying size contrast include interactions of contours.