Determinants of the Bourdon effect

Rozvany, G. I. N.; Day, R. H.

doi:10.3758/bf03204313

Cited by 14 publications

(51 citation statements)

References 6 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At the latter angle, the Bourdon illusion in the standard figure is very slight or negligible (Rozvany & Day, 1980). At 45°, it is large and positive.…”

Section: Resultsmentioning

confidence: 80%

“…The point is made even more strongly in Figure 3C, in which the two outline components with short edges are again widely separated. Rozvany and Day (1980) showed that the Bourdon illusion is markedly weaker in outline figures than in solid figures of the same dimensions. This observation was confirmed by both Walker and Shank (1987) and Wenderoth and O'Connor (1987a).…”

Section: Discussionmentioning

confidence: 99%

“…This illusion was originally described by Bourdon (1902) in a horizontal version of Figure 1. In the first systematic investigation of the effect, Rozvany and Day (1980) found it to be relatively strong in solid (i.e., "filled-in") figures such as Bourdon's (1902) original figure but weak, negligible, or even slightly negative in outline figures. They also found that the illusion was maximal when the central angles were about 12.5°and the whole figure tilted with the straight edge at about 22.5°, as in Figure 1.…”

mentioning

confidence: 99%

See 2 more Smart Citations

The bourdon illusion occurs with straight-, right-angle-, and parallel-edge figures

Day

Mitchell

Stecher

1990

Perception & Psychophysics

Self Cite

View full text Add to dashboard Cite

“…At the latter angle, the Bourdon illusion in the standard figure is very slight or negligible (Rozvany & Day, 1980). At 45°, it is large and positive.…”

Section: Resultsmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

The bourdon illusion occurs with straight-, right-angle-, and parallel-edge figures

Day

Mitchell

Stecher

1990

Perception & Psychophysics

Self Cite

View full text Add to dashboard Cite

“…The figures were oriented as shown with the colinear edges making an angle of 22.5°with the vertical. This combination of apex angle and orientation previously produced the greatest Bourdon illusion in real contours (Rozvany & Day, 1980), and was also used for consistency with our previous study of the illusion in subjective contours (Walker & Shank, 1987). Figure 2 shows the series of 15 comparison stimuli usedin judging the apparent displacements in the illusion figures.…”

Section: Methodsmentioning

confidence: 99%

“…Outline figures produce weaker Bourdon illusions, and sometimes produce apparent displacements in the opposite direction-that is, the test contours sometimes appear displaced away from the induction contours in outline figures (Luckiesh, 1922(Luckiesh, /1965Rozvany & Day, 1980;Wenderoth & O'Connor, 1987b;Wenderoth, O'Connor, & Johnson, 1986). Solid figures produce stronger Bourdon illusions, and subjective contours produce still greater effects (Walker & Shank, 1987).…”

mentioning

confidence: 99%

Interactions between real and subjective contours in the Bourdon illusion

Walker

Shank

1988

Perception & Psychophysics

View full text Add to dashboard Cite

The Bourdon illusion is a contour-attraction effect in which two colinear test edges of a plane figure appear displaced toward a bent induction edge located nearby. This illusion and related effects are stronger in subjective contours than in real contours. In Bourdon figures combining both varieties of contours, real induction contours produced a strong illusion in subjective test contours, but subjective induction contours produced no illusion in real test contours. Thus, interactions between real and subjective contours were asymmetrical. Luminance contrast between real and subjective contours weakened the Bourdon illusion.

show abstract

The Effects of Display and Observer Strategy Variables on Bourdon Assimilation Illusions

Wenderoth

O’Connor

1987

Perception

View full text Add to dashboard Cite

When a solid (filled-in) triangle is mirror-reflected about its vertex such that one angle arm and its reflection form a straight edge, this straight edge appears as a chevron bent in the direction of the other sides of the triangles, an effect directionally opposite to the well-known tilt illusion that occurs with outline angles. It has been proposed that these negative solid-angle illusions (assimilation effects) which occur in dual-angle (Bourdon-type) displays result from a failure to discriminate between the test (judged) edges and the bisectors of the solid angles. In dual-angle outline displays, near-zero effects have been attributed to the availability of collinearity cues. These hypotheses were tested in two experiments in which cues to collinearity were reduced by inserting gaps between the angles and in which collinearity information was increased by adding thick 'necks' to the displays. The results are consistent with predictions and implicate not only the nature of the angle display, but also the way in which observers perform the matching task in the production of assimilation effects.

show abstract

Determinants of the Bourdon effect

Cited by 14 publications

References 6 publications

The bourdon illusion occurs with straight-, right-angle-, and parallel-edge figures

The bourdon illusion occurs with straight-, right-angle-, and parallel-edge figures

Interactions between real and subjective contours in the Bourdon illusion

The Effects of Display and Observer Strategy Variables on Bourdon Assimilation Illusions

Contact Info

Product

Resources

About