The Ehrenstein illusion

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  • HAMADA JIRO
    Faculty of integrated Arts and Sciences, University of Tokushima

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  • エーレンシュタイン錯視
  • コントラストの極性・線端間距離・線分方向の効果
  • Effects of contrast polarity, gap size, and line orientation

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The illusory strength of Ehrenstein figures with positive (black lines on gray background) or negative (white lines on gray background) contrasts, and gap sizes, and line orientations was investigated. Irrespective of contrast polarity, the gray between the lines was judged to be darker than the same gray in a figure without lines. The effect of gap size depended on contrast polarity: With positive contrast the illusion was strongest for the small gap and decreased with increasing gap size: with negative contrast the illusion was weakest for the small gap and increased with gap size. With mixed-contrast patterns (alternating light and dark radial lines) the perceived lightness laid between that of the positive and negative contrast figures. Horizontal and vertical lines had more influence than oblique lines in mixed-contrast: When they were negative, the results more nearly resembled those of pure negative contrast: when they were positive, the results resembled those of positive contrast. The results might he interpreted within the context of a compound model of contrast perception with local antagonistic and global nonantagonistic inhibition.

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