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Article Dans Une Revue (Article De Synthèse) Attention, Perception, and Psychophysics Année : 2022

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

Résumé

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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Dates et versions

hal-04048550 , version 1 (10-05-2023)

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Frédéric Devinck, Christophe Quaireau. Optimizing the strength of the Bourdon effect by varying the triangle arrangement. Attention, Perception, and Psychophysics, 2022, 84 (2), pp.519-528. ⟨10.3758/s13414-021-02379-x⟩. ⟨hal-04048550⟩
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