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  • Title: Are illusory contours a cause or a consequence of apparent differences in brightness and depth in the Kanizsa square?
    Author: Watanabe T, Oyama T.
    Journal: Perception; 1988; 17(4):513-21. PubMed ID: 3244523.
    Abstract:
    The causal flows between the processes responsible for illusory contour clarity, brightness, and apparent depth in the Kanizsa square were examined. The sixty-four stimuli used consisted of all possible combinations of eight disk luminances and eight centre-to-centre separations between nearest disks. Ten subjects were instructed to rate the clarity of the illusory contour and the brightness and apparent depth differences between the Kanizsa square and its surround in each stimulus. On the basis of results obtained with the causal inference method, using partial correlations and path analysis, it is suggested that clarity of illusory contour can be influenced directly by disk separation, and that the output from the process responsible for illusory contour clarity has some effect on the processes responsible for the apparent depth and brightness differences.
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