The decrease in the threshold on the dark side of the luminance edge in the after-flash effect.
D005260:Female; D005403:Fixation, Ocular; D006801:Humans; D008027:Light; D008297:Male; D010783:Photometry; D012684:Sensory Thresholds; D013997:Time Factors; D014796:Visual Perception / Q000502:physiology*