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

International audienceThe 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

Decision processes and recognition memory in an information retrieval task: there is more than one memory trace.

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Decision processes and recognition memory in an information retrieval task: remembering versus knowing that the item was a target.

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Évolution fortement différenciée de la capacité à gérer l’implicite des textes chez les collégiens, en fonction du parcours (ordinaire vs SEGPA)

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Interaction « compétences en statistiques x fréquence de feedback » : différences entre sujets anxieux et non anxieux

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Interaction « compétences en statistiques x fréquence de feedback » : différences entre sujets anxieux et non anxieux

International audienc