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doi:10.1068/p6383 LAST BUT NOT LEAST Illusory movement of dotted lines

By Hiroyuki Ito Stuart Anstisô

Abstract

Abstract. When oblique rows of black and white dots drifted horizontally across a mid-grey surround, the perceived direction of motion was shifted to be almost parallel to the dotted lines and was often nearly orthogonal to the real motion. The reason is that the black/white contrast signals between adjacent dots along the length of the line are stronger than black/grey or white/grey contrast signals across the line, and the motion is computed as a vector sum of local contrast-weighted motion signals. Please examine figures 1 ^ 5. Hover a stationary pencil point above each figure and move the page slowly to the right, or else move the fixated pencil point slowly to the left. View from close-up, since the effects are best in peripheral vision. In the control condition of figure 1 the two oblique lines appear to move inwards, consistent with the retinal stimulation, since the lines really do move inwards toward the fovea as the pattern moves to the right. Figure 1. Control condition: put a pen tip on the black spot and move it to the left, tracking it with your eyes. Result: lines appear to move inwards, consistent with the retinal stimulation. However, the dotted lines in figure 2 appear to move outwards (away from eac

Year: 2009
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