Anomalous orientation effects in the Bourdon illusion

Verstijnen, Ilse M; Leeuwen, Cees van

doi:10.3758/bf03212953

Cited by 1 publication

(6 citation statements)

References 11 publications

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“…In accordance with previous studies (Rozvany & Day, 1980;Verstijnen & van Leeuwen, 1998), the figures were oriented at an angle of 22.5°from the vertical axis (see angle α in Figs. 1b and c), to maximize the Bourdon illusion.…”

Section: Stimulisupporting

confidence: 73%

“…1b), and is far weaker when the whole pattern is either vertical or at an angle of 45°from the vertical axis. Similar results have been found for different mirrored orientations (Verstijnen & van Leeuwen, 1998). Studies of the Bourdon illusion have typically examined the stimulus configuration that produces it.…”

Section: Introductionsupporting

confidence: 73%

“…1). These values had produced the strongest illusions in previous studies (Rozvany & Day, 1980;Verstijnen & van Leeuwen, 1998). In the present experiment, the triangles were displayed with five different angle γ values, ranging from 4°t o 135°in steps of 22.5°(see Fig.…”

Section: Stimulimentioning

confidence: 74%

“…In the second experiment, we manipulated the angle γ so that its values ranged from 45°to 135°. The dashed line indicates the direction of possible adjustments to edges AB and BC (Rozvany & Day, 1980;Verstijnen & van Leeuwen, 1998), whereas the 45°angle formed an isosceles triangle.…”

Section: Stimulimentioning

confidence: 99%

“…The impact of triangle orientation on the Bourdon illusion has been extensively tested, with most researchers showing that a specific oblique orientation creates the strongest illusion, and a horizontal or vertical orientation the weakest one (Rozvany & Day, 1980;Verstijnen & van Leeuwen, 1998;Wenderoth & O'Connor, 1987a). However, although the right-angled triangle is known to be an important contributor to the illusion, the impact of the triangle shape has not yet been systematically explored.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing the strength of the Bourdon effect by varying the triangle arrangement

Devinck¹,

Quaireau²

2021

Atten Percept Psychophys

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The Bourdon illusion refers to the perceived bentness of the straight collinear edges when two right-angled triangles are placed apex to apex. We studied this illusion using a cancellation method. In the first of three experiments, we manipulated the apex angle, with six different angles ranging from 4°to 45°. Results indicated that the Bourdon illusion is strongest when the angle is around 12°. In the second experiment, we compared four scalene triangles with a right-angled triangle. The angular shift was most salient when the shape corresponded to a right-angled triangle. In the third experiment, the patterns were created by varying the size of one right-angled triangle while holding the size of the second right-angled triangle constant. Results indicated that the Bourdon illusion was strongest when both right-angled triangles were of equal size. Our data suggest that the Bourdon illusion depends critically upon the specific arrangement of shapes in the display.

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Section: Stimulisupporting

confidence: 73%

Section: Introductionsupporting

confidence: 73%

Section: Stimulimentioning

confidence: 74%

Section: Stimulimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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