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Vol.22 No.1

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The effect of width of contacting region of Koffka’s ring on brightness homogeneity

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
2010, v.22 no.1, pp.41-58
https://doi.org/10.22172/cogbio.2010.22.1.004

(2010). The effect of width of contacting region of Koffka’s ring on brightness homogeneity. The Korean Journal of Cognitive and Biological Psychology, 22(1), 41-58, https://doi.org/10.22172/cogbio.2010.22.1.004

Abstract

A gray ring placed against a black and white background is perceived as uniformly bright unless two half rings are separated, which is known as Koffka's ring. When the width of the ring was narrowed, each half ring was perceived to have different brightness. In the present study, the dependency of uniform brightness on the width of ring was tested by manipulating the length of inner contour of the ring and width of contacting lines between two half rings, which are covaried with the width of Koffka's ring. The results showed that the length of inner contour has little effect, but the brightness of half rings is greatly changed depending on the length of contacting lines. These results suggest that uniform brightness in Koffka's ring would be produced by mixture of the different brightness from each of half rings and a sufficient region might be necessary for brightness spreading.

keywords
Koffka's ring, brightness contrast, the width of contacting region, filling-in, Koffka 고리, 밝기 대비, 접촉면의 폭, 채워넣기

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