Lightness in a Flash: Effect of Exposure Time on Lightness Perception

Sae Kaneko, Alan Gilchrist

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


A gray target can appear lighter or darker depending on its surrounding spatial context. We examined the effect of exposure time on three such examples (simultaneous lightness contrast, dungeon illusion, and the two-room arrangement), finding very different results with exposure time as brief as 15 ms: the simultaneous lightness contrast was much stronger, the effect of the dungeon illusion was reversed, and the lightness difference between the two isoluminant patches in the two-room arrangement disappeared. These suggest that local luminance ratios dominate lightness perception in a brief flash.

Original languageEnglish
Issue number6
Publication statusPublished - 2020


  • exposure time
  • illusion
  • lightness/brightness
  • spatial context

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Ophthalmology
  • Sensory Systems
  • Artificial Intelligence


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