Effects of Contour Proximity and Lightness on Delboeuf Illusions Created by Circumscribed Letters

Jaeger, Ted; Long, Sihui

doi:10.2466/pms.105.1.253-260

Cited by 7 publications

(9 citation statements)

References 24 publications

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“…As the magnitude of the Delboeuf illusion also varies with changes in the contrast between the figural elements and their backgrounds (Jaeger & Lorden, 1980), some interdependence between the two effects is possible. The illusory lightness enhancement gives support to lower level (structural) mechanisms (Coren, 1999), relying on sensory processes (Jaeger & Long, 2007), being at the root of the classical Delboeuf effect.…”

Section: Discussionmentioning

confidence: 98%

Illusory Lightness in the Delboeuf Figure

Zanuttini

Daneyko

2010

Percept Mot Skills

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A white disk presented inside a small concentric circle (a display like the Delboeuf figure) looks lighter than when inside a larger one. The magnitude of the effect was measured with 20 observers (10 women, 10 men; ages 19 to 26 years). The decrements in luminance of the disk inside the smaller circle, in order to match the lightness of the disk inside the larger circle, are reported for three different grey backgrounds and correspond to 9.13, 10.33, and 10.46%.

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Section: Discussionmentioning

confidence: 98%

Illusory Lightness in the Delboeuf Figure

Zanuttini

Daneyko

2010

Percept Mot Skills

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“…Besides the Van Ittersum study that tested the Delboeuf illusion with respect to plate size and plate coloring and serving behavior (17), and a study that tested the illusion on irregular objects (20), almost all past research on the Delboeuf illusion has been applied to circles and squares. This study extends this prior research on plate size by testing the application of the Delboeuf illusion to images of food and plate design characteristics.…”

Section: Discussionmentioning

confidence: 99%

“…The Delboeuf illusion demonstrates that a circle appears larger when surrounded by a slightly larger circle, but smaller when surrounded by a much larger circle (19) (Figure 1). The proximity and the color contrast of the concentric circles affect the illusion (20-23). Research suggests that when the space between concentric circles is small (right image of Figure 1), the circles appear to be one whole object (24).…”

Section: Introductionmentioning

confidence: 99%

“…Experiment 2 examines the effect of rim coloring on perceived food portion size. Prior work suggests that the Delboeuf illusion is strongest when the outer circle is only slightly larger and/or the color is more greatly contrasted with the inner circle (20-23). Therefore, in Experiment 1 we hypothesized wider rims (and thus the closer the inner edge of the rim surrounds the food) would cause food to appear larger on the same sized plate (Hypothesis 1).…”

Section: Introductionmentioning

confidence: 99%

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Visual illusions and plate design: the effects of plate rim widths and rim coloring on perceived food portion size

et al. 2013

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OBJECTIVEThe Delboeuf Illusion affects perceptions of the relative sizes of concentric shapes. This study was designed to extend research on the application of the Delboeuf illusion to food on a plate by testing whether a plate’s rim width and coloring influence perceptual bias to affect perceived food portion size.DESIGN AND METHODSWithin-subjects experimental design. Experiment 1 tested the effect of rim width on perceived food portion size. Experiment 2 tested the effect of rim coloring on perceived food portion size. In both experiments, participants observed a series of photographic images of paired, side-by-side plates varying in designs and amounts of food. From each pair, participants were asked to select the plate that contained more food. Multi-level logistic regression examined the effects of rim width and coloring on perceived food portion size.RESULTSExperiment 1: Participants overestimated the diameter of food portions by 5% and the visual area of food portions by 10% on plates with wider rims compared to plates with very thin rims (P<0.0001). The effect of rim width was greater with larger food portion sizes. Experiment 2: Participants overestimated the diameter of food portions by 1.5% and the visual area of food portions by 3% on plates with rim coloring compared to plates with no coloring (P=0.01). The effect of rim coloring was greater with smaller food portion sizes.CONCLUSIONThe Delboeuf illusion applies to food on a plate. Participants overestimated food portion size on plates with wider and colored rims. These findings may help design plates to influence perceptions of food portion sizes.

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“…Studies have also shown a contrast effect for larger ratios (after a transition at a ratio of about 4:1). When the larger circle is large enough compared to the inner circle, the effect shifts to contrast and the inner circle appears to be smaller than a standard circle of the same size (Goto et al, ; Jaeger & Long, ). Except for the size ratio of the concentric circles, other factors may influence the strength of the Delboeuf illusion.…”

mentioning

confidence: 99%

The snow tire illusion: Different levels of perceptual assimilation across a single stimulus configuration

2018

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While observing a specific traffic sign in the field, we noticed an apparent distortion of size and shape of the circle that contained the sign. This novel illusion manifests as a distortion of the horizontal compared to the vertical dimension of the sign. The illusion seems to be underlined by similar mechanisms to those in the Delboeuf illusion. The aim of our study was to determine the existence and magnitude of the snow tire illusion. We conducted two experiments using the method of constant stimuli. The first experiment was conducted on the standard sign, while in the second, the stimuli were rotated 90° counterclockwise. Both experiments consisted of three conditions: the snow tire, the ellipse, and the simple circle (control) conditions. The data showed a robust illusion effect for both the standard and rotated sign compared to the control condition, with a large majority of participants experiencing the illusion. The snow tire illusion seems to be a combination of assimilation mechanisms of different magnitudes. The assimilation is larger for one dimension of the sign, thus producing the shape distortion. The illusion may be a manifestation of a thus far undocumented non-uniform effect of assimilation on perceived size and shape.

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Effects of Contour Proximity and Lightness on Delboeuf Illusions Created by Circumscribed Letters

Cited by 7 publications

References 24 publications

Illusory Lightness in the Delboeuf Figure

Illusory Lightness in the Delboeuf Figure

Visual illusions and plate design: the effects of plate rim widths and rim coloring on perceived food portion size

The snow tire illusion: Different levels of perceptual assimilation across a single stimulus configuration

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