Local brightness mechanisms sketch out surfaces but do not fill them in: psychophysical evidence in the Kanizsa square - Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg Accéder directement au contenu
Article Dans Une Revue Perception and Psychophysics Année : 1992

Local brightness mechanisms sketch out surfaces but do not fill them in: psychophysical evidence in the Kanizsa square

Résumé

In two experiments, brightness enhancement of the illusory surface in the Kanizsa square was investigated by means of a brightness matching procedure. The results show that specific properties of the inducing elements such as size, spacing, and luminance have effects on the matching threshold that are similar to those previously obtained in experiments on simultaneous contrast. The data from a third experiment demonstrate that increment thresholds measured within the Kanizsa square are elevated when the target is flashed on a position close to the inducing elements. The thresholds decrease considerably in the center of both test and control figures (representing or not representing an illusory square). These observations suggest that low-level mechanisms are likely to explain local brightness differences within the configurations but not global figure brightness. In other words, local contrast seems to generate brightness information that "sketches out" surfaces at their surrounds but does not "fill" them "in."
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hal-02168856 , version 1 (29-06-2019)

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  • HAL Id : hal-02168856 , version 1
  • PUBMED : 1437489

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Birgitta Dresp. Local brightness mechanisms sketch out surfaces but do not fill them in: psychophysical evidence in the Kanizsa square. Perception and Psychophysics, 1992, 52 (5), pp.562-70. ⟨hal-02168856⟩
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