Bright lines and edges facilitate the detection of small light targets. - Ecole Nationale du Génie de l'Eau et de l'Environnement de Strasbourg Accéder directement au contenu
Article Dans Une Revue Spatial Vision Année : 1993

Bright lines and edges facilitate the detection of small light targets.

Résumé

Thresholds for the detection of a small light target (increment thresholds), measured at the ends of white lines and small luminance edges, are lower than when the target is presented on a plain field. This facilitation effect disappears when: (1) the line-end is 'stopped' by another line with perpendicular orientation; (2) the inducing line is black instead of white; and (3) when the inducer does not carry information about orientation (e.g., a small dot). These observations suggest that polarity specific and orientation selective neural activation, extending collinearly from the inducing lines and edges, produces a local increase in visual sensitivity. The possible role of such a mechanism in contour completion and the formation of illusory contours is discussed.
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Dates et versions

hal-02168852 , version 1 (29-06-2019)

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  • HAL Id : hal-02168852 , version 1
  • PUBMED : 8251435

Citer

Birgitta Dresp. Bright lines and edges facilitate the detection of small light targets.. Spatial Vision, 1993, 7 (3), pp.213-25. ⟨hal-02168852⟩
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