Bright lines and edges facilitate the detection of small light targets. - Archive ouverte HAL Access content directly
Journal Articles Spatial Vision Year : 1993

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

(1)
1

Abstract

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.
Not file

Dates and versions

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

Identifiers

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

Cite

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

Altmetric

Share

Gmail Facebook Twitter LinkedIn More