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Akiko Yasuoka, Masahiro Ishii; Subjective contour yielded by cue combination. Journal of Vision 2014;14(10):979. doi: https://doi.org/10.1167/14.10.979.
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© ARVO (1962-2015); The Authors (2016-present)
A random dot stereogram is a pair of images consisting of thousands of randomly placed dots with lateral displacements that produce depth perception when viewed stereoscopically. When an identical disparity is given to the dots within a region, one can perceive not only depth but a subjective contour on the boundary of the region. The subjective contour cannot be seen when the dot density of the stereogram is low. Imagine a chromatic defined region on a random dot image instead of a disparity defined region on a stereogram. For a dense random dot image, one can discriminate chromatic dots and perceive a subjective contour. The subjective contour cannot be seen when the image consists of sparse dots. In the current study, we investigate the effect of cue combination on yield of subjective contour. Three experiments were conducted as a series. Experiment 1 was conducted to determine the stimulus condition in which the subject can perceive depth of the dots but no subjective contour of the region from the stereogram. The stimulus consisted of white dots on a black background. The region was determined by a crossed disparity. Experiment 2 was conducted to determine the stimulus condition in which the subject can perceive the colored dots but no subjective contour from the image. The color of the dots in the region was green and the color of the dots out of the region was white. The dots in the region and the dots out of the region have zero relative disparity. The other experiment was conducted to investigate the effect of cue combination on yield of subjective contour. The stimulus conditions were determined using the results of the foregoing experiments. The dots in the region had both color and disparity. We found that the cue combination yielded subjective contour.
Meeting abstract presented at VSS 2014
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