ホワイト効果とカニッツァのモーダル/アモーダル完結化

概要

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When gray and black alternating bars in white and black alternating grids were observed through a stereoscope, the visual system detects an imaginary rectangle of gray bars which appeared in the rear or front stereoscopic plane. The rectangle in the rear stereoscopic plane looked a modally completed and opaque dark gray. The dark gray was caused by the contrast with the white background. The rectangle in the front stereoscopic plane looked modally completed, translucent and blackish. The black was caused by the assimilation to the black grids in the rear stereoscopic plane. When the rectangle was moved to and fro horizontally, both rear and front rectaneles looked more vivid and blacker. These results indicate that ihoth contrast and assimilation are closely related to object perception in the real world, reminiscent of Kanizsas modal and amodal completions. When a focal area is admitted as a thing, two phenomena tend to occur; one is called contrast, which exaggerates the difference between the thing and the not-thing, while the other is called, assimilation, which neglects any differences within the thing.
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