The spatial contrast suppression is polarity selective(Summary of Awarded Presentation at the 30th Annual Meeting)
2012 年 31 巻 1 号 p. 83-84
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2012 年 31 巻 1 号 p. 83-84
A perceived contrast of a texture pattern is decreased by a surrounding texture of higher contrast. Although this contrast-contrast illusion has been considered to be based on the spatial interactions between visual sensors that encode the absolute (unsigned) contrast, we recently demonstrated that contrast-contrast is selective to the polarity of contrast. The apparent contrast of a texture composed of sparse bright (dark) elements was strongly suppressed by surrounding textures of bright (dark) elements, but not at all by those of dark (bright) elements. Polarity selectivity does not appear for textures with densely placed elements because these texture unavoidably activates both the on and off sensors. Hence, we conclude that the contrast-contrast illusion is largely due to polarity-selective interactions between visual sensors.
