Delboeuf illusion: Displacement versus diameter, arc deletions, and brightness contrast.

Weintraub, Daniel J.; Wilson, Barbara A.; Greene, Richard D.; Palmquist, Marjorie J.

doi:10.1037/h0027424

Cited by 33 publications

(25 citation statements)

References 15 publications

(10 reference statements)

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“…In support of the view by Pollack ( 1969), investigations of Type I ill usions have revealed that the magnitude of the illusory effect is enhanced with increases in the brightness difference between the indueing parts of the figures and their backgrounds (Oyama, 1961;Weintraub, Wilson, Green, & Palmquist, 1969). Furthermore, Pollack (1963) discovered that sensitivity to brightness contrast declines as age increases from 8 to 12 years.…”

mentioning

confidence: 63%

The effect of simulated receptor aging on two types of visual illusions

Sjostrom

Pollack

1971

Psychon Sci

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confidence: 63%

The effect of simulated receptor aging on two types of visual illusions

Sjostrom

Pollack

1971

Psychon Sci

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“…A line enclosed in a frame, or flanked by other lines, looks larger under some conditions than an unenclosed comparison line (Brigell, Uhlarik, & Goldhorn, 1977;Fellows, 1968;Kunnapas, 1955;Weintraub & Schneck, 1986;Weintraub, Wilson, Greene, & Palmquist, 1969). The effect is maximal at a framing ratio of about 2: 1 or less-that is, when the frame is about twice as long as the enclosed line.…”

Section: Experiments 4 Results and Discussionmentioning

confidence: 95%

The vista paradox: A natural visual illusion

Walker

Rupich

Powell

1989

Perception & Psychophysics

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Suppose an observer views a distant object through a window in the far wall of a room or corridor-a visual scene consituting a vista. If the observer moves toward the window, then the distant object will shrink in apparent size and appear farther away. These effects are paradoxical, because the distant object appears smaller as its visual angle increases. The vista paradox occurs under many other real-world conditions, such as viewing a distant object while moving out of the mouth of a valley, or driving across a topographic crest. In the present study, framing effects and the equidistance tendency are considered as possible factors. However, an explanation based on the dynamic relationship between the visual angle of the framing portion of a vista and the visual angle of a distant object appears more promising.

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“…There is abundant evidence for the concentric Delboeuf display that the less the reflectance contrast of an inducing circle, the less the contour-attraction effect (Cooper & Weintraub, 1970;Weintraub et al, 1969). Thus, fading out a contour will gradually eliminate size misjudgments.…”

Section: Resultsmentioning

confidence: 99%

Fragments of Delboeuf and Ebbinghaus illusions: Contour/context explorations of misjudged circle size

Weintraub

Schneck

1986

Perception & Psychophysics

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Variants ofthe Delboeuf (concentric circle) display and the Ebbinghaus display (four large nonconcentric inducing circles) were produced by systematically eliminating fractions of the circumferences of the outer inducing circles. For the Ebbinghaus display, various amounts of the inner arcs and/or outer arcs were preserved; a series of dots was sometimes substituted for missing contours. Results are described by the following statements: Contours attract. Larger nonconcentric circles induce size contrast. Rotating an Ebbinghaus variant by 45°alters size misjudgments. The larger the horizontal (or vertical) extent of the inducing configuration, the smaller the judged size of the test (center) circle. A figural aftereffect of the inducing configuration acts to reduce the perceptual size of the comparison circle when eye movements are permitted between test and comparison circles.The term illusion, because of its connotations of magic and deception, neither of which is germane to the topic at hand, shall be restricted to the title. Informativeness requires its inclusion in the title. At issue are explanations of the Delboeuf anomaly, size misjudgments of a circle in the presence of a concentric circle, and the related Ebbinghaus (Titchener circles) anomaly, which depends upon the presence of nearby nonconcentric circles. The underlying problem is to understand the processes underlying misperceived circle size. The present investigation relies upon displays that are sometimes only distant cousins to Delboeuf and Ebbinghaus figures.The research was designed to explore elements of a theory proposed on the basis of relatively modest evidence (Cooper & Weintraub, 1970;Weintraub & Cooper, 1972) but more recently buttressed by extensive evidence (Weintraub, 1979). In barest outline, the contour/circle-context model asserts that contours attract and that context supplied by the larger or smaller size of nearby nonconcentric circles leads to size contrast. Contour attraction, then, predicts that exterior contours produce overestimation of Experiment 2 was based on research by the second author for his senior honors thesis in the Psychology Department, University of Michigan.

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Delboeuf illusion: Displacement versus diameter, arc deletions, and brightness contrast.

Cited by 33 publications

References 15 publications

The effect of simulated receptor aging on two types of visual illusions

The effect of simulated receptor aging on two types of visual illusions

The vista paradox: A natural visual illusion

Fragments of Delboeuf and Ebbinghaus illusions: Contour/context explorations of misjudged circle size

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