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Abstract: An experiment is designed to study the influence of such factors as depthcue and completion tendency on the formation of subjective contour. The figureused is adapted from G. Kanizsa. By varying the length of the broken edges ofthe triangle the guthors provide depth cues of four different levels, and foundthe subjective contour is a function of the obviousness of depth cue. From thisexperiment, authors suggested that subjective contour, in analogy to otherillusions, is dependent upon the complex interaction between a series of objectiveand subjective factors.

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