Contrast discrimination function: spatial cuing effects.
The effects of spatial cuing were measured for discrimination between an increment and a decrement on a target's pedestal contrast. Discrimination thresholds measured in the absence of a spatial cue were always higher than corresponding thresholds measured in the presence of a spatial cue, except when pedestal contrast was near zero. Uncued discrimination thresholds rose monotonically with pedestal contrast; cued discrimination thresholds formed a dipper function of pedestal contrast. A spatial-uncertainty model incorporating a nonlinear transducer produced similar results.
Solomon
J A
JA
Institute of Ophthalmology, London, UK.
Lavie
N
N
Morgan
M J
MJ
D015350:Contrast Sensitivity / Q000502:physiology*; D003463:Cues; D004192:Discrimination, Psychological / Q000502:physiology*; D006801:Humans; D008954:Models, Biological; D010775:Photic Stimulation / Q000379:methods; D013028:Space Perception / Q000502:physiology*