Department of Psychology, Chiba University
Department of Psychology, Chiba University
1972 Volume 14 Issue 4 Pages 204-208
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A configuration looking like a cross of a black rectangle and a white rectangle on a mid-gray background was uniformly illuminated. Illuminance was varied over 2.4 log units in five steps. Each of 10 Ss was asked to judge which one, the black or the white, looked transparent or in front. The percent of “white” judgments generally increased as illuminance was increased. The effect was most marked when the central overlapping area had an intermediate lightness. The findings of this experiment demonstrated that apparent transparency obeyed the law of similarity of a critical area and its neighboring areas, Illuminance was interpreted as one of the most important factors determining the degree of mutual similarity.