December 2012
Volume 12, Issue 14
Free
OSA Fall Vision Meeting Abstract  |   December 2012
Lateral modulation of contrast detection and discrimination
Author Affiliations
  • Chien-Chung Chen
    Department of Psychology, National Taiwan University, Taipei, Taiwan
Journal of Vision December 2012, Vol.12, 31. doi:10.1167/12.14.31
  • Views
  • Share
  • Tools
    • Alerts
      ×
      This feature is available to Subscribers Only
      Sign In or Create an Account ×
    • Get Citation

      Chien-Chung Chen; Lateral modulation of contrast detection and discrimination. Journal of Vision 2012;12(14):31. doi: 10.1167/12.14.31.

      Download citation file:


      © ARVO (1962-2015); The Authors (2016-present)

      ×
  • Supplements
Abstract

The visual performance to a visual target can be changed by the presence of another visual stimulus (Flanker) nearby. Many theories have been proposed to explain the flanker effects. We used a dual-task paradigm, in which an observer is to detect a target superimposed on a pedestal and in the presence of flankers, to investigate the mechanisms underlying such flanker effects. The typical result is that, compared with the no-flanker conditions, the target threshold vs. pedestal contrast (TvC) functions shifted horizontally on log-log coordinates when the flanker appears. This result can be explained by a model in which the effect of the flankers is to modulate both the excitatory and the divisive inhibitory sensitivity of the target mechanism to both the target and the pedestal. The flanker effect depends on spatial configuration of stimuli, such as the relative distance, location, orientation, phase, and depth between the target and the flankers. Such spatial configuration dependence suggests that the flanker effect may serve a function for contour and surface completion.

Meeting abstract presented at OSA Fall Vision 2012

×
×

This PDF is available to Subscribers Only

Sign in or purchase a subscription to access this content. ×

You must be signed into an individual account to use this feature.

×