Contour Entropy: A New Determinant of Perceiving Ground or a Hole

Figure-ground perception is typically described as seeing one surface occluding another. Figure properties, not ground properties, are considered the significant factors. In scenes, however, a near surface will often occlude multiple contours and surfaces, often at different depths, producing alignm...

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Veröffentlicht in:Journal of experimental psychology. Human perception and performance 2011-06, Vol.37 (3), p.750-757
Hauptverfasser: Gillam, Barbara J, Grove, Philip M
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creator Gillam, Barbara J
Grove, Philip M
description Figure-ground perception is typically described as seeing one surface occluding another. Figure properties, not ground properties, are considered the significant factors. In scenes, however, a near surface will often occlude multiple contours and surfaces, often at different depths, producing alignments that are improbable except under conditions of occlusion. We thus hypothesized that unrelated (high entropy) lines would tend to appear as ground in a figure-ground paradigm more often than similarly aligned ordered (low entropy) lines. We further hypothesized that for lines spanning a closed area, high line entropy should increase the hole-like appearance of that area. These predictions were confirmed in three experiments. The probability that patterned rectangles were seen as ground when alternated with blank rectangles increased with pattern entropy. A single rectangular shape appeared more hole-like when the entropy of the enclosed contours increased. Furthermore, these same contours, with the outline shape removed, gave rise to bounding illusory contours whose strength increased with contour entropy. We conclude that figure-ground and hole perception can be determined by properties of ground in the absence of any figural shape, or surround, factors. (Contains 6 figures and 4 footnotes.)
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source MEDLINE; EBSCOhost APA PsycARTICLES; Applied Social Sciences Index & Abstracts (ASSIA)
subjects Appearance
Biological and medical sciences
Contours
Depth Perception
Entropy
Experimental psychology
Figure Ground Discrimination
Form and Shape Perception
Form Perception
Fundamental and applied biological sciences. Psychology
Geometric Concepts
Human
Humans
Influences
Optical Illusions
Perception
Perceptual Masking
Photic Stimulation
Predictions
Probability
Property
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Reference Values
Vision
Visual Perception
Visual Stimuli
title Contour Entropy: A New Determinant of Perceiving Ground or a Hole
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