COMPARATIVE STUDY OF ASSIMILATION-CONTRAST ILLUSION, FIGURAL AFTER-EFFECT AND TIME ERROR FOR EXTENTS OF CIRCLE AND LINE STIMULI
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概要
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The present study was designed to compare the figural after-effects of the outline circle, the solid circle, and the straight line, the illusions of concentric circles and parallel lines, and the effect of the inspection line upon the time error in the comparison of the lengths of lines, under unified control. Three figures of circles or of horizontal straight lines were presented by the brief exposure. The extra stimuli and the test stimuli were presented in the arrangement of the concentric circles or of the horizontal lines. The main results are as follows : <BR>1. The figural after-effects of the outline circle and the line appear approximately in the opposite directions, when the inspection line and the test line are presented at the overlapping locations. If the inspection line is long, the apparent length of the test line lengthens, while if the inspection line is short, that of the test line shortens. <BR>2. Figural after-effect of the solid circle occurs in the same type as in figural aftereffect of the outline circle. <BR>3. The illusion of concentric circles appears in the opposite direction to that of the after effect of the circle, roughly speaking. <BR>4. Where an extra line and the test line are presented simultaneously at the parallel locations, the apparent length of the test line lengthens, if the extra line is long and if the distance between lines is small. But the lengthening of the test line turns into the shortening if the distance is large. <BR>5. When I line is presented at various distant locations from T line, the after effect of I line varies irregularly with the variations of the distance and the time interval between I line and T line. <BR>6. When three lines are presented in succession and the inspection line is exposed first, the time error in the comparison of lines changes with the variations of the length of the inspection line, the time intervals and the spatial distance between lines. If the time intervals between lines are short, the apparent length of the second test line shortens or lengthens depending upon whether the inspection line is short or long, while if the time intervals are relatively long the above phenomenon turns into the reversed one. <BR>7. This reversal occurs at the short time intervals or at relatively long time intervals depending upon whether the inspection line is short or long.
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