ECVP 2001 abstract
Perceptually interpolated contours in shape discrimination
R F Murray, J M Gold, P J Bennett, A B Sekuler (Department of Psychology, University of Toronto, 100 St George Street, Toronto, Ontario M5S 3G3, Canada)
Observers use perceptually interpolated contours to perform some shape discrimination tasks, eg illusory and occluded contours to discriminate between Kanizsa squares (Murray et al, 2000 Perception 29 Supplement, 122). Do observers use contours defined only by perceptual grouping? We measured classification images in a task where observers discriminated between patterns made of four inward-facing Ls arranged as the corners of a square. The Ls were perceptually grouped as a square, but produced no illusory contours. Observers did not use whole sides of these grouping-defined squares. Rather, they mainly used the Ls, and were only slightly influenced by the empty regions between the Ls. This is in marked contrast to Murray et al's results with Kanizsa squares. Do observers use illusory contours that do not bound a region of illusory brightness? We measured classification images in a task where observers discriminated between Kanizsa squares defined by two white and two black inducers. These stimuli produced illusory contours, but the illusory square had the same brightness as the background. Observers did not use whole sides of the illusory square. Rather, they mainly used edges of the inducers. We conclude that different types of perceptually interpolated contours are not equally likely to be used to discriminate shapes.
Perceptually interpolated contours in shape discrimination
R F Murray, J M Gold, P J Bennett, A B Sekuler (Department of Psychology, University of Toronto, 100 St George Street, Toronto, Ontario M5S 3G3, Canada)
Observers use perceptually interpolated contours to perform some shape discrimination tasks, eg illusory and occluded contours to discriminate between Kanizsa squares (Murray et al, 2000 Perception 29 Supplement, 122). Do observers use contours defined only by perceptual grouping? We measured classification images in a task where observers discriminated between patterns made of four inward-facing Ls arranged as the corners of a square. The Ls were perceptually grouped as a square, but produced no illusory contours. Observers did not use whole sides of these grouping-defined squares. Rather, they mainly used the Ls, and were only slightly influenced by the empty regions between the Ls. This is in marked contrast to Murray et al's results with Kanizsa squares. Do observers use illusory contours that do not bound a region of illusory brightness? We measured classification images in a task where observers discriminated between Kanizsa squares defined by two white and two black inducers. These stimuli produced illusory contours, but the illusory square had the same brightness as the background. Observers did not use whole sides of the illusory square. Rather, they mainly used edges of the inducers. We conclude that different types of perceptually interpolated contours are not equally likely to be used to discriminate shapes.
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