Abstract
Illusory contours are not well understood, partially because a lack of physical substance complicates their specification via physical standards. One solution is to gauge illusory contours with respect to luminance-defined contours, which are easily quantified physically. Accordingly, we chose a metric (perceived contrast) that expresses illusory contour strength in terms of the physical contrast of luminance-defined contours. Using this metric, adult observers adjusted the contrast of a luminance-defined contour until it matched the perceived contrast of an illusory contour. Illusory contour length, inducer size, and inducer contrast all influenced illusory contour strength.. The results are adequately explained via low-level visual processes. It appears that matching paradigms can be beneficial in quantitative studies of illusory contours.
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This research was supported by the National Eye Institute through Grants T32EY07024 and F32EY06266 to T. Banton and Grant ROIEY01728 to D. Levi.
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Banton, T., Levi, D.M. The perceived strength of illusory contours. Perception & Psychophysics 52, 676–684 (1992). https://doi.org/10.3758/BF03211704
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DOI: https://doi.org/10.3758/BF03211704