盲点補完に及ぼす線分刺激と背景間の色差および輝度差の効果

抄録

Three experiments examined how the difference of color and/or luminance between line segments and background affect perceptual completion at the blind spot. When a pair of line segments was presented on the both sides of the blind spot while varying length of the segments, the observers reported whether the line segments appeared ‘a continuous line’ or not. We measured the minimum length of the line segments for perceptual completion, or filling-in, to occur. Experiment 1 examined how different colors of the line segment (red, green, blue, and gray) affect the minimum length of the line segments. Experiment 2 examined how different luminance of the line segments affect the minimum length of the line segments. Experiment 3 examined how the equiluminant chromatic, equichromatic luminance, and both chromatic and luminance difference between line segments and background affect the minimum length of the line segments. The results of the three experiments showed that the minimum length of line segments for perceptual completion to occur at the blind spot (a) did not change irrespective of different colors of line segments with large luminance difference between line segments and background, (b) was shorter, as luminance difference between line segments and background was increased, (c) was longer in both chromatic and luminance condition than that in the equichromatic luminance condition, and (d) was shorter in both chromatic and luminance condition than that in the equiluminant chromatic condition. The results suggest that both color and luminance affect perceptual completion at the blind spot, and that the luminance difference between line segments and background facilitates perceptual completion greater than color difference.